# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.168293        0.00722292    
     0.460000          0.700000          0.230144        0.00756989    
     0.700000           1.00000          0.281503        0.00949268    
      1.00000           1.54000          0.319771         0.0143944    
      1.54000           2.40000          0.332935         0.0243389    
      2.40000           4.80000          0.468175         0.0380604    
      4.80000           10.0000          0.431564         0.0830922