# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0407160         0.0116137    
     0.460000          0.700000         0.0433477         0.0110372    
     0.700000           1.00000         0.0834984         0.0118061    
      1.00000           1.54000          0.117119        0.00717792    
      1.54000           2.40000          0.111076        0.00571880    
      2.40000           4.80000         0.0666552        0.00460509    
      4.80000           10.0000         0.0461771        0.00529574