# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.160866        0.00438648    
     0.460000          0.700000          0.193098        0.00389807    
     0.700000           1.00000          0.214574        0.00444228    
      1.00000           1.54000          0.365224        0.00863370    
      1.54000           2.40000          0.415004         0.0144464    
      2.40000           4.80000          0.382213         0.0249814    
      4.80000           10.0000          0.342374         0.0668461