Moved the read_file operation out of the core routine for the co-plot function. When dealing with large files, reading the observable file is costly. With this change, scripts that import this function can supply an already read file, instead of forcing a re-read.
Moved the read_file operation out of the core routine for the co-plot function. When dealing with large files, reading the observable file is costly. With this change, scripts that import this function can supply an already read file, instead of forcing a re-read.

hmedina/KaSaAn