# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0304606        0.00226164    
     0.460000          0.700000         0.0331949        0.00214652    
     0.700000           1.00000         0.0305292        0.00255314    
      1.00000           1.54000         0.0250639        0.00243318    
      1.54000           10.0000         0.0107661        0.00258463