# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0959113        0.00900452    
     0.460000          0.700000         0.0946705        0.00855531    
     0.700000           1.00000         0.0874131        0.00923558    
      1.00000           1.54000         0.0706709         0.0126253    
      1.54000           10.0000         0.0626915         0.0166111