# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0465256        0.00152379    
     0.460000          0.700000         0.0503159        0.00154404    
     0.700000           1.00000         0.0532856        0.00178322    
      1.00000           1.54000         0.0575577        0.00186446    
      1.54000           2.40000         0.0621647        0.00220428    
      2.40000           4.80000         0.0619166        0.00284406    
      4.80000           10.0000         0.0456117        0.00401892