Column header string selection for 'using' entries matches first occurrence of given string as a substring in the list of column headers. If the given string exists as an exact match later in the column header list, this is probably not desired.
Example data file 'example.dat':
Example plot command:
plot 'example.dat' using "A"
will plot the values in column "AB" and will display "AB" as the data set title.
Running on Windows 7 Pro sp1
Gnuplot version 4.6 patchlevel 0 installed from gp460-win32-setup.exe.