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Hi everyone,
I am confused about auto_levels_opt. Could anyone explain to me, what is dzstretch_s, dzstretch-u, dzbot, and max_dz??
Actually, i want to set vertical grid spacing 50m up to 3km height and stretch to 200m above that.

Thank you.
Take a look at this FAQ that discusses these options. You will probably also need to click on the link to the Users' Guide provided in that FAQ, as well.