# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0336511        0.00281101    
     0.460000          0.700000         0.0382511        0.00362111    
     0.700000           1.00000         0.0374303        0.00513304    
      1.00000           1.54000         0.0535295        0.00853623    
      1.54000           2.40000         0.0798042         0.0158598    
      2.40000           4.80000         0.0294668         0.0323247    
      4.80000           10.0000         0.0859584         0.0511739