# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.311584        0.00710741    
     0.460000          0.700000          0.320625        0.00605174    
     0.700000           1.00000          0.347440        0.00756413    
      1.00000           1.54000          0.458270         0.0116663    
      1.54000           2.40000          0.485903         0.0205836    
      2.40000           4.80000          0.422654         0.0290536    
      4.80000           10.0000          0.310663         0.0558887