# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0252888         0.0150819    
     0.460000          0.700000         0.0367087         0.0100459    
     0.700000           2.40000         0.0100103         0.0132405    
      2.40000           4.80000         0.0163832         0.0127118    
      4.80000           10.0000         0.0250557        0.00596371