# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0992990        0.00713112    
     0.460000          0.700000          0.105305        0.00569910    
     0.700000           1.00000          0.107155        0.00510206    
      1.00000           1.54000          0.110821        0.00518388    
      1.54000           2.40000          0.122718        0.00555968    
      2.40000           4.80000          0.130730        0.00780720    
      4.80000           10.0000          0.127764         0.0106433