# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0585741         0.0420048    
     0.460000          0.700000         0.0321945         0.0316901    
     0.700000           1.00000         0.0578379         0.0160836    
      1.00000           1.54000         0.0501456         0.0102220    
      1.54000           2.40000         0.0533187        0.00813000    
      2.40000           4.80000         0.0687744        0.00777327    
      4.80000           10.0000         0.0866405        0.00790705