"X Perg"
  E(keV)    dE(keV)   F(ph/(cm^2.s.keV))   Error(1 sigma)
   31.50      4.75        1.62e-04        1.14e-05
   42.75      6.50        1.07e-04        6.13e-06
   57.75      8.50        7.55e-05        9.97e-06
   78.00     11.75        3.24e-05        4.07e-06
  105.25     15.50        8.58e-06        2.85e-06
  142.00     21.25        5.70e-07        2.53e-06