# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0295668        0.00464648    
     0.460000          0.700000         0.0401394        0.00422298    
     0.700000           1.00000         0.0564644        0.00449657    
      1.00000           1.54000         0.0679836        0.00448777    
      1.54000           2.40000         0.0780874        0.00572915    
      2.40000           4.80000         0.0862489        0.00825836    
      4.80000           10.0000         0.0929609         0.0171726