# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.121830        0.00849955    
     0.460000          0.700000          0.149546        0.00879693    
     0.700000           1.00000          0.157650         0.0111366    
      1.00000           1.54000          0.199904         0.0172077    
      1.54000           2.40000          0.206827         0.0316805    
      2.40000           4.80000          0.236019         0.0540554    
      4.80000           10.0000          0.459261          0.125904