# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000          0.158616         0.0600235    
     0.700000           1.00000          0.183021         0.0622310    
      1.00000           1.54000          0.219592         0.0246499    
      1.54000           2.40000          0.159629         0.0235136    
      2.40000           4.80000          0.137977         0.0202322    
      4.80000           10.0000          0.112884         0.0392032