# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0603213        0.00866193    
     0.460000          0.700000         0.0334818         0.0123632    
     0.700000           1.00000         0.0462543         0.0141358    
      1.00000           1.54000         0.0701257         0.0108758    
      1.54000           4.80000         0.0582296         0.0127210    
      4.80000           10.0000         0.0620631         0.0470701