Φ measures of Bose-Einstein correlations for different multiplicity distributions in high energy heavy-ion collisions

Φ measures of Bose-Einstein correlations are studied for four different pion multiplicity distributions. It is found that Φ measures depend strongly on the multiplicity distribution if the phase space density becomes large. To exclude the effects of the multiplicity fluctuations, Φ measures for fixed multiplicities should be calculated. The effects of multiplicity fluctuation on the Φ* measure are also discussed.