# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0225537        0.00470157    
     0.460000          0.700000         0.0166920        0.00312500    
     0.700000           1.00000         0.0147453        0.00240133    
      1.00000           1.54000         0.0200868        0.00153024    
      1.54000           2.40000         0.0215443        0.00150939    
      2.40000           4.80000         0.0204228        0.00174388    
      4.80000           10.0000         0.0131560        0.00243452