How to convert lon lat data extracted from Mapping Toolbox?

Here is my code trying to extract the longitude and latitude info out of mapping tool box so that I can make my own plots within app-deisigner (right now it does not support mapping toolbox):

load coastlines
axesm mercator
p = plotm(coastlat, coastlon);           
xlswrite('map.xlsx', [p.XData', p.YData']);

The issue is that the longitude and latitude values look very weird. Instead of having a range of -180 and 180 for longitude and -90 and 90 for latitude. They both range from -3 to 3.

Anyone knows how to convert them back to the regular longitude and latitude range?

Thanks!

[Geoff Hayes]

Leon - isn't the original data just the coastlat and coastlon variables? It could be that hte XData and YData correspond to the positions as drawn on your axes.

[Leon]

Thank you so much! This basically answers my question.

So bad I can't accept your answer, because it is posted as a comment.

Liqing