# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.334554        0.00710928    
     0.460000          0.700000          0.353644        0.00741423    
     0.700000           1.00000          0.348204         0.0108763    
      1.00000           1.54000          0.295052         0.0165222    
      1.54000           2.40000          0.358610         0.0263143    
      2.40000           4.80000          0.292231         0.0276194    
      4.80000           10.0000          0.294527         0.0390644