# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.188381        0.00957990    
     0.460000          0.700000          0.199705        0.00592692    
     0.700000           1.00000          0.236713        0.00684118    
      1.00000           1.54000          0.293962         0.0106517    
      1.54000           2.40000          0.274192         0.0168357    
      2.40000           4.80000          0.279042         0.0225560    
      4.80000           10.0000          0.237273         0.0421743