# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0941552        0.00163557    
     0.460000          0.700000          0.108796        0.00144559    
     0.700000           1.00000          0.112446        0.00188320    
      1.00000           1.54000          0.114959        0.00172685    
      1.54000           2.40000          0.116614        0.00200833    
      2.40000           4.80000          0.107559        0.00234025    
      4.80000           10.0000         0.0992828        0.00328018