modify plot_contour to include a "collapse" parameter - allows users to decide which direction to "slice" along if dealing with 3d data (the function previously only allowed taking slices in x, making it hard to plot the contours in any view that wasn't yz).
modify plot_contour to include a "collapse" parameter - allows users to decide which direction to "slice" along if dealing with 3d data (the function previously only allowed taking slices in x, making it hard to plot the contours in any view that wasn't yz).