ttme 



presen iaiiort 



f Z A 6 n . 2^ 



presfnfation. 



; Z ^ 6 



prescnffiiion 



1â . Z^ 



1^ 



predminary warrning 



Fig. 5. Presentalion-lime at 30", 35", 37" and 38" C 



I 2 'z 6 fZ 



preltmtnary u'arnunp 



