# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000        0.00953948        0.00327228    
     0.700000           1.00000        0.00998958        0.00693801    
      1.00000           1.54000         0.0136297         0.0136171    
      1.54000           2.40000         0.0195617         0.0225499    
      2.40000           4.80000         0.0505490         0.0325223    
      4.80000           10.0000         0.0844940         0.0523529