0018933 SSpicked EEX SiegITERSST _— Oe eee — eo Mo?? as calculated from each of them should be identical. This indicates that the light and variable layer is not representative of the total cloud. The Mo?? fractions calculated from csl37 and sr89 | the two nuclides having the longest lived noble gas precursors, are compared with the Mo?? fractions calculated from Kr®8 in Table 3.8.