I want to create a trajectory plot, being that each trajectory is a
set of XY pairs (2 columns).

For that I've been using the scatter plot, however if I select more
then one pair of XY columns Excel creates multiple Y series using the
first column as X axis values for all the series. So I have been
forced to add series one by one in the Select data menu.

Since I have hundreds of trajectories to plot, I'm searching for a
more practical way to add series to the graph.

I would greatly appreciate any help on this issue.