# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000        0.00920333        0.00730513    
      1.54000           2.40000        0.00896607         0.0102461    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000        0.00867973         0.0194509