# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0613395        0.00397191    
     0.460000          0.700000         0.0628740        0.00356830    
     0.700000           1.00000         0.0620355        0.00347723    
      1.00000           1.54000         0.0595275        0.00282021    
      1.54000           2.40000         0.0544832        0.00291903    
      2.40000           4.80000         0.0480312        0.00371712    
      4.80000           10.0000         0.0410544        0.00492965