# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0103767        0.00370810    
     0.460000          0.700000        0.00701457        0.00355859    
     0.700000           1.00000         0.0148157        0.00285848    
      1.00000           1.54000         0.0145290        0.00307491    
      1.54000           2.40000        0.00990717        0.00493963    
      2.40000           4.80000         0.0161933        0.00523554    
      4.80000           10.0000         0.0230450        0.00724408