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+#!/usr/bin/env python3
+# coding=utf-8
+# Filename: cherenkov_muon.py
+# Author: Tamas Gal <tgal@km3net.de>
+"""
+Plot PDF of Cherenkov light from muon using Jpp interpolation tables.
+
+Usage:
+    cherenkov_muon.py [options] -f FILE_DESCRIPTOR
+    cherenkov_muon.py (-h | --help)
+
+Options:
+    -f FILE_DESCRIPTOR  Descriptor of the PDFs (e.g. $JPP_DIR/data/J%p.dat).
+    --energy=<GeV>      Muon energy [default: 1.0].
+    --distance=<m>      Distance of approach [default: 50].
+    --tts=<ns>          PMT time smearing [default: 0.0].
+    --xmin=<ns>         X-axis minimum [default: -20].
+    --xmax=<ns>         X-axis maximum [default: 500].
+    --ymin=<P/t>        Y-axis minimum [default: 1e-7].
+    --ymax=<P/t>        Y-axis maximum [default: 1e-2].
+    --n-points=<n>      Number of points to calculate [default: 1000].
+    -o OUTFILE          Plot file [default: cherenkov_muon.png].
+    -h --help           Show this screen.
+
+"""
+from docopt import docopt
+docopt(__doc__)
+
+import functools
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import jppy
+
+
+def main():
+    from docopt import docopt
+    args = docopt(__doc__)
+
+    directions = {
+        "north": (0, 0),
+        "east": (np.pi / 2, 0),
+        "south": (np.pi, 0),
+        "west": (np.pi / 2, np.pi)
+    }
+
+    muon_pdf = jppy.pdf.JMuonPDF(args['-f'], TTS=float(args['--tts']))
+
+    xs = np.linspace(float(args['--xmin']), float(args['--xmax']),
+                     int(args['--n-points']))
+
+    fig, ax = plt.subplots()
+
+    for direction, (theta, phi) in directions.items():
+        pdf = lambda t: muon_pdf.calculate(E=float(args['--energy']),
+                                           R=float(args['--distance']),
+                                           theta=theta,
+                                           phi=phi,
+                                           t1=t).f
+        ax.plot(xs, list(map(pdf, xs)), label=direction)
+        ax.set_yscale("log")
+
+    plt.ylim([float(args['--ymin']), float(args['--ymax'])])
+    plt.ylabel(r"$\frac{dP}{dt}$ / (npe/ns)")
+    plt.xlabel(r"$\Delta$t / ns")
+    plt.legend()
+    plt.grid(True)
+    plt.savefig(args['-o'])
+    print("The plot has been saved as {}".format(args['-o']))
+
+
+if __name__ == '__main__':
+    main()