# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0664475         0.0324022    
     0.460000          0.700000          0.130797         0.0130099    
     0.700000           1.00000          0.149424        0.00717192    
      1.00000           1.54000          0.152550        0.00384536    
      1.54000           2.40000          0.141492        0.00355226    
      2.40000           4.80000          0.145227        0.00408735    
      4.80000           10.0000          0.122438        0.00498939