# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0633948        0.00138059    
     0.460000          0.700000         0.0682564        0.00139356    
     0.700000           1.00000         0.0793124        0.00172537    
      1.00000           1.54000         0.0978605        0.00208532    
      1.54000           2.40000          0.115042        0.00291653    
      2.40000           4.80000          0.130422        0.00457800    
      4.80000           10.0000          0.133348        0.00745293