diff --git a/.gitignore b/.gitignore
index 4bebd19..9676920 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 /.idea/
 /build/
 /output/
+/notebooks/.ipynb_checkpoints
 !gradle-wrapper.jar
diff --git a/build.gradle b/build.gradle
index 9b36dbc..d64e25d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,7 +16,6 @@ repositories {
 
 dependencies {
     compile group: 'org.apache.commons', name: 'commons-math3', version: '3.6.1'
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
 
     // https://mvnrepository.com/artifact/org.apache.commons/commons-rng-simple
     compile group: 'org.apache.commons', name: 'commons-rng-simple', version: '1.1'
@@ -28,12 +27,3 @@ compileKotlin {
     kotlinOptions.jvmTarget = "1.8"
 }
 
-//task runTrap(type: JavaExec) {
-//    classpath = sourceSets.main.runtimeClasspath
-//
-//    main = mainClassName
-//
-//    // arguments to pass to the application
-//    args 'D:\\Work\\Numass\\trapping\\trap.out'
-//}
-
diff --git a/notebooks/images/Cross-sections.png b/notebooks/images/Cross-sections.png
new file mode 100644
index 0000000..637123d
Binary files /dev/null and b/notebooks/images/Cross-sections.png differ
diff --git a/notebooks/images/spectra.pdf b/notebooks/images/spectra.pdf
new file mode 100644
index 0000000..a5fa6f6
Binary files /dev/null and b/notebooks/images/spectra.pdf differ
diff --git a/notebooks/images/spectra.svg b/notebooks/images/spectra.svg
new file mode 100644
index 0000000..4cc8989
--- /dev/null
+++ b/notebooks/images/spectra.svg
@@ -0,0 +1 @@
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opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M416.96,320V200.77H430.63V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M430.63,320V202.83H444.3V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M444.3,320V203.48H457.97V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M457.97,320V197.88H471.65V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M471.65,320V199.09H485.32V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g><g class="point"><path d="M485.32,320V195.54H498.99V320Z" style="vector-effect: non-scaling-stroke; 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fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M6.84,320V193.96H20.51V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M20.51,320V209.36H34.18V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M34.18,320V225.51H47.85V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M47.85,320V220.66H61.52V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M61.52,320V226.63H75.19V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M75.19,320V225.33H88.86V320Z" style="vector-effect: non-scaling-stroke; 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opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M170.89,320V224.3H184.56V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M184.56,320V229.43H198.23V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M198.23,320V224.3H211.9V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M211.9,320V226.54H225.57V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M225.57,320V231.68H239.24V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M239.24,320V220.38H252.91V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M252.91,320V226.17H266.58V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M266.58,320V228.59H280.25V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M280.25,320V229.34H293.92V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M293.92,320V221.22H307.59V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M307.59,320V225.61H321.27V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M321.27,320V225.42H334.94V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M334.94,320V225.79H348.61V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M348.61,320V223.55H362.28V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M362.28,320V221.03H375.95V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M375.95,320V220.38H389.62V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M389.62,320V216.92H403.29V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M403.29,320V222.9H416.96V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M416.96,320V217.11H430.63V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M430.63,320V220.38H444.3V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M444.3,320V216.55H457.97V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M457.97,320V218.51H471.65V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M471.65,320V218.79H485.32V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M485.32,320V216.08H498.99V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M498.99,320V218.6H512.66V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M512.66,320V217.02H526.33V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M526.33,320V215.52H540V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g><g class="point"><path d="M540,320V266.41H553.67V320Z" style="vector-effect: non-scaling-stroke; opacity: 1; stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g></g></g></g></g><g class="overplot"/><path class="xlines-above crisp" d="M0,0" style="fill: none;"/><path class="ylines-above crisp" d="M0,0" style="fill: none;"/><g class="overlines-above"/><g class="xaxislayer-above"><g class="xtick"><text text-anchor="middle" x="0" y="433" transform="translate(80,0)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">0</text></g><g class="xtick"><text text-anchor="middle" x="0" y="433" transform="translate(216.71,0)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">1000</text></g><g class="xtick"><text text-anchor="middle" x="0" y="433" transform="translate(353.42,0)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">2000</text></g><g class="xtick"><text text-anchor="middle" x="0" y="433" transform="translate(490.13,0)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">3000</text></g></g><g class="yaxislayer-above"><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,420)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">0</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,373.32)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">500</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,326.63)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">1000</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,279.95)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">1500</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,233.27)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">2000</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,186.57999999999998)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">2500</text></g><g class="ytick"><text text-anchor="end" x="79" y="4.199999999999999" transform="translate(0,139.9)" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">3000</text></g></g><g class="overaxes-above"/></g></g><g class="polarlayer"/><g class="ternarylayer"/><g class="geolayer"/><g class="pielayer"/><g class="glimages"/><defs id="topdefs-9bc377"><g class="clips"/><clipPath id="legend9bc377"><rect width="411" height="29" x="0" y="0"/></clipPath></defs><g class="layer-above"><g class="imagelayer"/><g class="shapelayer"/></g><g class="infolayer"><g class="legend" pointer-events="all" transform="translate(80, 452)"><rect class="bg" shape-rendering="crispEdges" width="411" height="29" x="0" y="0" style="stroke: rgb(68, 68, 68); stroke-opacity: 1; fill: rgb(255, 255, 255); fill-opacity: 1; stroke-width: 0px;"/><g class="scrollbox" transform="translate(0, 0)" clip-path="url(#legend9bc377)"><g class="groups"><g class="traces" transform="translate(0, 14.5)" style="opacity: 1;"><g class="layers" style="opacity: 0.5;"><g class="legendfill"/><g class="legendlines"/><g class="legendsymbols"><g class="legendpoints"><path class="legendbar" d="M6,6H-6V-6H6Z" transform="translate(20,0)" style="stroke-width: 0px; fill: rgb(31, 119, 180); fill-opacity: 1;"/></g></g></g><text class="legendtext user-select-none" text-anchor="start" x="40" y="4.680000000000001" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">E = 12 keV</text><rect class="legendtoggle" pointer-events="all" x="0" y="-9.5" width="411" height="19" style="cursor: pointer; fill: rgb(0, 0, 0); fill-opacity: 0;"/></g><g class="traces" transform="translate(102.640625, 14.5)" style="opacity: 1;"><g class="layers" style="opacity: 0.5;"><g class="legendfill"/><g class="legendlines"/><g class="legendsymbols"><g class="legendpoints"><path class="legendbar" d="M6,6H-6V-6H6Z" transform="translate(20,0)" style="stroke-width: 0px; fill: rgb(255, 127, 14); fill-opacity: 1;"/></g></g></g><text class="legendtext user-select-none" text-anchor="start" x="40" y="4.680000000000001" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">E = 14 keV</text><rect class="legendtoggle" pointer-events="all" x="0" y="-9.5" width="411" height="19" style="cursor: pointer; fill: rgb(0, 0, 0); fill-opacity: 0;"/></g><g class="traces" transform="translate(205.28125, 14.5)" style="opacity: 1;"><g class="layers" style="opacity: 0.5;"><g class="legendfill"/><g class="legendlines"/><g class="legendsymbols"><g class="legendpoints"><path class="legendbar" d="M6,6H-6V-6H6Z" transform="translate(20,0)" style="stroke-width: 0px; fill: rgb(44, 160, 44); fill-opacity: 1;"/></g></g></g><text class="legendtext user-select-none" text-anchor="start" x="40" y="4.680000000000001" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">E = 16 keV</text><rect class="legendtoggle" pointer-events="all" x="0" y="-9.5" width="411" height="19" style="cursor: pointer; fill: rgb(0, 0, 0); fill-opacity: 0;"/></g><g class="traces" transform="translate(307.921875, 14.5)" style="opacity: 1;"><g class="layers" style="opacity: 0.5;"><g class="legendfill"/><g class="legendlines"/><g class="legendsymbols"><g class="legendpoints"><path class="legendbar" d="M6,6H-6V-6H6Z" transform="translate(20,0)" style="stroke-width: 0px; fill: rgb(214, 39, 40); fill-opacity: 1;"/></g></g></g><text class="legendtext user-select-none" text-anchor="start" x="40" y="4.680000000000001" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 12px; fill: rgb(68, 68, 68); fill-opacity: 1; white-space: pre;">E = 18 keV</text><rect class="legendtoggle" pointer-events="all" x="0" y="-9.5" width="411" height="19" style="cursor: pointer; fill: rgb(0, 0, 0); fill-opacity: 0;"/></g></g></g><rect class="scrollbar" rx="20" ry="3" width="0" height="0" x="0" y="0" style="fill: rgb(128, 139, 164); fill-opacity: 1;"/></g><g class="g-gtitle"/><g class="g-xtitle"><text class="xtitle" x="350" y="472" text-anchor="middle" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 14px; fill: rgb(68, 68, 68); opacity: 1; font-weight: normal; white-space: pre;">ε (eV)</text></g><g class="g-ytitle"><text class="ytitle" transform="rotate(-90,42,260)" x="42" y="260" text-anchor="middle" style="font-family: 'Open Sans', verdana, arial, sans-serif; font-size: 14px; fill: rgb(68, 68, 68); opacity: 1; font-weight: normal; white-space: pre;">N</text></g></g></svg>
\ No newline at end of file
diff --git a/src/main/kotlin/ru/inr/mass/trapping/Scatter.kt b/src/main/kotlin/ru/inr/mass/trapping/Scatter.kt
index bddd60f..a6e4bed 100644
--- a/src/main/kotlin/ru/inr/mass/trapping/Scatter.kt
+++ b/src/main/kotlin/ru/inr/mass/trapping/Scatter.kt
@@ -8,7 +8,7 @@ import org.apache.commons.math3.util.Pair
  *
  * The initial code was written by Ferenc Glueck and then rewritten by [Sebastian Voecking](mailto:seb.voeck@uni-muenster.de)
  *     into C++. To reference the code, don't forget to also include [kasiopea](http://stacks.iop.org/1367-2630/19/i=5/a=053012).
- * @author Darksnake
+ * @author Alexander Nozik
  */
 object Scatter {
 
diff --git a/src/main/kotlin/ru/inr/mass/trapping/Simulator.kt b/src/main/kotlin/ru/inr/mass/trapping/Simulator.kt
index f248255..350242f 100644
--- a/src/main/kotlin/ru/inr/mass/trapping/Simulator.kt
+++ b/src/main/kotlin/ru/inr/mass/trapping/Simulator.kt
@@ -15,7 +15,7 @@ import ru.inr.mass.trapping.Scatter.counter
 import ru.inr.mass.trapping.Scatter.debug
 
 /**
- * @author Darksnake
+ * @author Alexander Nozik
  * @property magneticField Longitudal magnetic field distribution
  * @property gasDensity gas density in 1/m^3
  */
@@ -420,7 +420,7 @@ class Simulator(
                 }
             }
 
-            assert(!java.lang.Double.isNaN(theta))
+            require(!theta.isNaN())
 
             return theta
         }