# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0838032        0.00145858    
     0.460000          0.700000         0.0958107        0.00139214    
     0.700000           1.00000          0.103988        0.00160781    
      1.00000           1.54000          0.118499        0.00212010    
      1.54000           2.40000          0.144365        0.00301496    
      2.40000           4.80000          0.153559        0.00391845    
      4.80000           10.0000          0.183787        0.00736469