This describes the contents of the xbt directories.

There is a separate directory for each cruise (N1-N9).

Each directory contains;

*.XBT files : These files contain the quality-controlled
              xbt data.

*ACTUAL.TXT : These files summarize the best and final
              location, time, and seafloor depth for each 
              CTD and XBT station on each cruise.

WFALL_N*.PDF: An Adobe PDF file containing waterfall plots
              of vertical temperature profiles derived from 
              both the CTD and XBT data in line order.