# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.244815        0.00210849    
     0.460000          0.700000          0.247212        0.00171457    
     0.700000           1.00000          0.253040        0.00168299    
      1.00000           1.54000          0.262765        0.00177877    
      1.54000           2.40000          0.242200        0.00224047    
      2.40000           4.80000          0.202417        0.00291635    
      4.80000           10.0000          0.163258        0.00434413