# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0519593        0.00928387    
     0.460000          0.700000         0.0640145         0.0111622    
     0.700000           1.00000         0.0563081         0.0156333    
      1.00000           1.54000         0.0647736         0.0169592    
      1.54000           10.0000         0.0325811         0.0305085