# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0715642        0.00291885    
     0.460000          0.700000         0.0702593        0.00224642    
     0.700000           1.00000         0.0625206        0.00229779    
      1.00000           1.54000         0.0592766        0.00217480    
      1.54000           2.40000         0.0576543        0.00258448    
      2.40000           4.80000         0.0411285        0.00306376    
      4.80000           10.0000         0.0321421        0.00431861