# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00857012        0.00730491    
     0.460000          0.700000        0.00725827        0.00674641    
     0.700000           1.00000        0.00750379        0.00908700    
      1.00000           4.80000         0.0184486        0.00304179    
      4.80000           10.0000         0.0376927        0.00220746