[GrADS] How to mark the cities in the contour map?

[Qingfang Dai]

Hi All,

I want to mark 2 cities in a contour map. The lattitude and longitude of
these two cities are (53.32,-113.58 ) and (51.12,-114.02). So I used the
command 'draw mark 3 53.32 -113.58 1' and 'draw mark 3 51.12 -114.02 1' in
the .gs file but I they didn't work. Please tell me how I can mark the two
cities in the contour map with closed circle and cities name. Thanks.

Qingfang