  The HEGRA system of imaging atmospheric Cherenkov telescopes provides for
specially selected classes of events an angular resolution of better than 3'.
By comparing the measured angular distribution of TeV gamma rays from the Crab
Nebula with the distribution expected on the basis of Monte Carlo simulations,
and with measurements of gamma rays from the point source Mrk 501, we conclude
that the rms size of the VHE gamma-ray emission region in the Crab Nebula is
less than 1.5'.
