# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0206092        0.00850320    
     0.460000           1.54000        0.00704321        0.00470494    
      1.54000           2.40000         0.0168258        0.00880926    
      2.40000           4.80000         0.0112422        0.00942871    
      4.80000           10.0000         0.0313584         0.0108241