2D finite element data visualization

I have a data file showing the x and y coordinates of the points with a connectivity list followed. The data is in .tec format and in the header I have,
ZONE N = 52, E=51, F=FEPOINT, ET=
coordinates as x and y here
connectivity list here.

My question is that I do not know what should I write as the value for ET. I tried several options but I the best I got was the points themselves and the connecting lines were not plotted.
Do you have any suggestions for plotting the data correctly?