Nothing
if (getRversion() >= "2.15.1") {
utils::globalVariables(
c("..string..", "..angle..", "..crown_diameter..", "..h_reduction..",
"..d_reduction..", "..randomness..", "..angle_cv..", "..length_cv..",
"..leaf_size..", "from_x", "to_x", "from_y", "to_y",
"geometry", "type", "lc", "bc", "tree_id", ".")
)
}
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