# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.230407        0.00711399    
     0.460000          0.700000          0.241618        0.00701728    
     0.700000           1.00000          0.303349        0.00883175    
      1.00000           1.54000          0.487150         0.0150409    
      1.54000           2.40000          0.436804         0.0208779    
      2.40000           4.80000          0.372477         0.0289193    
      4.80000           10.0000          0.269729         0.0557001