# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0156126        0.00780114    
     0.700000           1.00000         0.0517734         0.0111282    
      1.00000           1.54000         0.0523698        0.00797637    
      1.54000           2.40000         0.0910305        0.00634864    
      2.40000           4.80000         0.0939911        0.00461611    
      4.80000           10.0000         0.0643794        0.00473657