Nothing
angle <-
function(cut.slope, ref.slope, tick.dist){
cut.slope <- cut.slope/tick.dist
ref.slope <- ref.slope/tick.dist
acos((1 + cut.slope * ref.slope)/(sqrt((1 + cut.slope^2)*(1 + ref.slope^2)))) #/
#tick.dist #/ 4 * pi
}
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