# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.350263        0.00576065    
     0.460000          0.700000          0.366244        0.00560874    
     0.700000           1.00000          0.402161        0.00821166    
      1.00000           1.54000          0.466201         0.0131581    
      1.54000           2.40000          0.487611         0.0204574    
      2.40000           4.80000          0.420075         0.0299061    
      4.80000           10.0000          0.421974         0.0564469