# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0176232        0.00274120    
     0.460000          0.700000         0.0163247        0.00275973    
     0.700000           1.00000         0.0128341        0.00546149    
      1.00000           1.54000         0.0156971        0.00394938    
      1.54000           2.40000         0.0200752        0.00390519    
      2.40000           4.80000         0.0190701        0.00414342    
      4.80000           10.0000         0.0257947        0.00521503