# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0255945        0.00485162    
     0.460000          0.700000         0.0287330        0.00418444    
     0.700000           1.00000         0.0306881        0.00618922    
      1.00000           1.54000         0.0387979        0.00626100    
      1.54000           2.40000         0.0377720        0.00881543    
      2.40000           10.0000         0.0376549        0.00966863