Trajectory plot on height-latitude cross-section

[See Hai Ooi]

Dear all,

     I am aware that GrADS has forward and backward
trajectory script.  However, can someone share with me
his/her script for plotting such trajectory as
height-latitude cross-section ? For example, I would
like to select 294K equivalent potential temperature
as the air parcel tracer to have its trajectory
plotted as height-latitude cross-section.

    Thank you.

Sincerely,

Ooi See Hai

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