# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.193849        0.00906914    
     0.460000          0.700000          0.225257        0.00876287    
     0.700000           1.00000          0.263484         0.0123085    
      1.00000           1.54000          0.454956         0.0222219    
      1.54000           2.40000          0.447190         0.0382287    
      2.40000           4.80000          0.512075         0.0550844    
      4.80000           10.0000          0.494975          0.101925