# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00547593        0.00885385    
     0.460000          0.700000        0.00891632        0.00794789    
     0.700000           2.40000        0.00837350        0.00494873    
      2.40000           4.80000         0.0180197         0.0147756    
      4.80000           10.0000         0.0422780         0.0201493