VIII 
Progressive vector diagrams (PVD) for 
common recording period from February 26, 
16,05 GMT to March 13, 13.55 GMT. They 
are based on 24,8” s1liding means, 
Tick-marks have been set every 24 hours, 
beginning on February 28, 00,00 GMT, 
Depth, direction and scale are given 
for each PVD. For comparison purposes 
mean vector with identical scale and 
origin are given for each set of PVD's 
as insert, 
Asterix indicates a record which was 
bterminated before March 13, 13,55 GMT.