kev_plot.py

import numpy as np
import matplotlib.pyplot as plt
import sys

ME   = 9.1093897e-28
CL   = 2.99792458e10
HPL  = 6.6260755e-27
LSUN = 3.827e33
KEV  = 1000.*1.6021772e-12

fnam = 'spectrum.dat'
if len(sys.argv) == 2:
  fnam = sys.argv[1]

data = np.loadtxt(fnam)
#nu = 10.**(data[:,0])*ME*CL**2/HPL
nu = data[:,0]
kev = HPL*nu/KEV

NVAR = 1
nbin = (len(data[0])-1)//NVAR
print(nbin)

nuLnu = np.zeros([nbin, len(nu)])
for n in range(nbin):
  nuLnu[n,:] = data[:,NVAR*n+1]

ax = plt.subplot(1,1,1)
for n in range(nbin):
  ax.step(kev, nuLnu[n], where='mid')
  #ax.step(nu, nuLnu[n], where='mid')
#ax.step(nu, nuLnu.mean(axis=0), where='mid', color='k')
#ax.step(nu, nuLnu[-1], where='mid', color='k', linewidth=2)
ax.set_xscale('log'); ax.set_yscale('log')
ax.set_xlim([1.e-2, 1.e3])
#ax.axvline(1000.*ME*CL**2/HPL, color='k', linestyle='--')
nuLnu_max = nuLnu.max()
#ax.set_ylim([1.e28, 1.e37])
#ax.set_ylim([1.e-10*nuLnu_max, 1.e1*nuLnu_max])
#ax.set_xlim([1.e10, 1.e22])
plt.show()