# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0649063        0.00308390    
     0.460000          0.700000         0.0659394        0.00311850    
     0.700000           1.00000         0.0771439        0.00370051    
      1.00000           1.54000         0.0783089        0.00497175    
      1.54000           2.40000         0.0862057        0.00818408    
      2.40000           4.80000         0.0868070         0.0153110    
      4.80000           10.0000          0.165782         0.0248841