# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.195013        0.00184623    
     0.460000          0.700000          0.194921        0.00182375    
     0.700000           1.00000          0.190990        0.00211231    
      1.00000           1.54000          0.184821        0.00199501    
      1.54000           2.40000          0.172541        0.00257309    
      2.40000           4.80000          0.158302        0.00286755    
      4.80000           10.0000          0.129330        0.00393071