# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00649968        0.00489858    
     0.460000          0.700000        0.00940592        0.00280507    
     0.700000           1.00000         0.0115993        0.00269326    
      1.00000           1.54000        0.00608720        0.00385670    
      1.54000           2.40000         0.0131601        0.00321598    
      2.40000           4.80000         0.0145164        0.00455149    
      4.80000           10.0000         0.0168812        0.00672401