You can find in this post a Plots.jl solution to the first question, and a PGFPlotsX.jl solution (from PGFPlots manual: major tick length and minor tick length) to the second one.
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You can find in this post a Plots.jl solution to the first question, and a PGFPlotsX.jl solution (from PGFPlots manual: major tick length and minor tick length) to the second one.