# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.179464        0.00593684    
     0.460000          0.700000          0.196041        0.00528975    
     0.700000           1.00000          0.210215        0.00661595    
      1.00000           1.54000          0.263705         0.0110490    
      1.54000           2.40000          0.296885         0.0166552    
      2.40000           4.80000          0.273881         0.0283264    
      4.80000           10.0000          0.228346         0.0713661