# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.167258        0.00396014    
     0.460000          0.700000          0.160029        0.00454488    
     0.700000           1.00000          0.160722        0.00480362    
      1.00000           1.54000          0.161573        0.00763011    
      1.54000           2.40000          0.103925        0.00868040    
      2.40000           4.80000         0.0946534         0.0159709    
      4.80000           10.0000         0.0711202         0.0258721