Hello, I have a dataframe with 3 values and that I would like to plot with contour: ``` > head(df) Y X Z 1 0.0008094667 50 1 2 0.0012360955 50 1 3 0.0016627243 50 1 4 0.0020893531 50 1 5 0.0025159819 50 1 6 0.0029426108 50 1 > contour(df$X, df$Y, df$Z) Error in contour.default(df$X, df$Y, df$Z) : increasing 'x' and 'y' values expected ``` Y is increasing, whereas X is decreasing. How shall I set the function? Thank you
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