How to set the plot size so the x,y axes are to scale?

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George McFadden 2012-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/43634-how-to-set-the-plot-size-so-the-x-y-axes-are-to-scale

I have plotted a figure using contour with inputs from meshgrid and interpolated data. The figure is of Nitrogen concentrations in a stream taken from a uniform sampling grid. The sampling grid is (3,5); so I sampled at 5 points across the stream width, making 1 transect. I performed 3 transects along the stream. The sampling area was 1.4 meters wide by 6 meters long, (normal shape for a stream). When the figure is generated the dimensions are square, however I want the figure to match the scale of the axes. So when the figure is viewed, it is to the scale of the stream.

Thank you for your time!