Nothing
# For checking package build
#
# Making some variables as "global" to clean up
# the package check.
# countour_plot: .output.
# slice_plot: .output.
# vectorfield_plot: x_start, x_end, y_start, y_end
#
utils::globalVariables(c(
".output.", "x_start", "y_start", "x_end", "y_end"
))
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