# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.342052        0.00449789    
     0.460000          0.700000          0.367527        0.00423412    
     0.700000           1.00000          0.380013        0.00394460    
      1.00000           1.54000          0.377324        0.00353408    
      1.54000           2.40000          0.345985        0.00385998    
      2.40000           4.80000          0.266554        0.00375252    
      4.80000           10.0000          0.155793        0.00514996