# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0563363         0.0182338    
     0.460000          0.700000         0.0595531         0.0134344    
     0.700000           1.00000          0.112226        0.00766196    
      1.00000           1.54000          0.157367        0.00333761    
      1.54000           2.40000          0.176078        0.00280491    
      2.40000           4.80000          0.195885        0.00266350    
      4.80000           10.0000          0.205918        0.00404056