We have studied the yield of individual. fragments formed in the proje
ctile fragmentation of gold nuclei at 1 AGeV incident on a carbon targ
et as a function of the total charge multiplicity, The yields of fragm
ents of different nuclear charge peak at different multiplicities, We
show that this behavior can be used to determine the critical exponent
a. We obtain a =0.68+/-0.05, consistent with the liquid-gas value.