# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0194497         0.0133331    
     0.460000          0.700000         0.0599719        0.00611457    
     0.700000           1.00000         0.0384584        0.00962808    
      1.00000           1.54000         0.0429057        0.00556302    
      1.54000           2.40000         0.0322607        0.00556637    
      2.40000           4.80000         0.0352298        0.00515326    
      4.80000           10.0000         0.0371463        0.00794495