CTD-data are listed in GOS2018111_CTD.txt 
There were no watersamples collected during GOS2018111, so GOS2018111_BTL.txt does not exist. 
Data are comma separated and use nan as fill value 
Varaible names and meaning of flags are explained in GOS2018111_meta_data.txt 
Units are given in GOS2018111_meta_data.txt