# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.179681        0.00218925    
     0.460000          0.700000          0.193352        0.00224426    
     0.700000           1.00000          0.208873        0.00255409    
      1.00000           1.54000          0.219435        0.00294193    
      1.54000           2.40000          0.216312        0.00373887    
      2.40000           4.80000          0.214742        0.00507628    
      4.80000           10.0000          0.169684        0.00769188