# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.114898        0.00703750    
     0.460000          0.700000          0.116053        0.00840619    
     0.700000           1.00000         0.0959204         0.0122957    
      1.00000           1.54000         0.0772719         0.0158381    
      1.54000           2.40000          0.136570         0.0169669    
      2.40000           4.80000          0.132698         0.0167822    
      4.80000           10.0000          0.149797         0.0151262