# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0119805        0.00614574    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000        0.00627041        0.00800110    
      1.00000           1.54000         0.0142949        0.00617931    
      1.54000           2.40000         0.0190317        0.00687504    
      2.40000           4.80000         0.0139122         0.0106169    
      4.80000           10.0000              -NaN              -NaN