turn on x-ticks for all plots in xy_23.ncl?

I am trying to make a plot very similar to the example xy_23.ncl:

http://www.ncl.ucar.edu/Applications/Scripts/xy_23.ncl

How does one turn on major tick marks (no labels) for the x-axes on the
upper plots (not just the lowest x-axis)?

Thanks,

Liz.

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Received on Mon May 5 16:28:54 2014