# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00796594        0.00548031    
      1.00000           1.54000         0.0117745         0.0111107    
      1.54000           2.40000         0.0168482         0.0135868    
      2.40000           4.80000         0.0403715         0.0120190    
      4.80000           10.0000         0.0389310         0.0265192