# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0955809         0.0272959    
     0.460000          0.700000          0.132784         0.0128241    
     0.700000           1.00000          0.135899        0.00528977    
      1.00000           1.54000          0.133822        0.00280640    
      1.54000           2.40000          0.137359        0.00252686    
      2.40000           4.80000          0.131156        0.00263098    
      4.80000           10.0000          0.120738        0.00369449