# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0224340        0.00270129    
     0.460000          0.700000         0.0178004        0.00232674    
     0.700000           1.00000         0.0188852        0.00274228    
      1.00000           1.54000         0.0160472        0.00307537    
      1.54000           2.40000         0.0124498        0.00460356    
      2.40000           10.0000        0.00753857        0.00554592