# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0169279        0.00953215    
     0.460000          0.700000         0.0250744        0.00520977    
     0.700000           1.00000         0.0338863        0.00669105    
      1.00000           1.54000         0.0260987        0.00456464    
      1.54000           2.40000         0.0264274        0.00493685    
      2.40000           4.80000         0.0225686        0.00416214    
      4.80000           10.0000         0.0235042        0.00591758