# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0751877        0.00943140    
     0.460000          0.700000         0.0678102        0.00793521    
     0.700000           1.00000         0.0423625        0.00899503    
      1.00000           1.54000         0.0540778        0.00882755    
      1.54000           2.40000         0.0555889         0.0107203    
      2.40000           4.80000         0.0743319         0.0133400    
      4.80000           10.0000         0.0503066         0.0190824