# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.123708         0.0389189    
     0.460000          0.700000          0.147845         0.0236236    
     0.700000           1.00000         0.0937029         0.0189587    
      1.00000           1.54000          0.156523        0.00643008    
      1.54000           2.40000          0.165269        0.00527756    
      2.40000           4.80000          0.155969        0.00530815    
      4.80000           10.0000          0.134082        0.00739659