# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0123904        0.00346480    
     0.460000          0.700000         0.0145805        0.00294684    
     0.700000           1.00000        0.00907233        0.00450220    
      1.00000           2.40000         0.0129936        0.00265550    
      2.40000           4.80000         0.0269571        0.00620150    
      4.80000           10.0000         0.0246658         0.0113796