# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00899540         0.0124441    
     0.460000          0.700000         0.0160799        0.00932170    
     0.700000           1.00000        0.00305419         0.0193034    
      1.00000           1.54000         0.0103265         0.0149271    
      1.54000           2.40000         0.0522626         0.0114627    
      2.40000           10.0000        0.00244921         0.0350383