# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0713965        0.00197169    
     0.460000          0.700000         0.0722589        0.00194169    
     0.700000           1.00000         0.0832617        0.00286899    
      1.00000           1.54000         0.0777000        0.00246671    
      1.54000           2.40000         0.0771157        0.00263506    
      2.40000           4.80000         0.0728984        0.00270358    
      4.80000           10.0000         0.0728514        0.00346835