# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00948241        0.00460425    
      1.00000           1.54000         0.0291787        0.00915815    
      1.54000           2.40000         0.0311422         0.0148354    
      2.40000           4.80000         0.0275587         0.0203375    
      4.80000           10.0000         0.0623264         0.0276529