Dear R,

I have a list of X,Y coordinates and a ratio associated with each
coordinate. The X and Y coordinates are continuous but random from 50-500, I
would like to make a continuous heatmap of the ratios at each coordinate.
One caveat is that the coordinates are clustered together do some bixes
might have too little data. I am wondering if there is a way that R can
automatically adjust box sizes? Sample data set is below

TIA

X    Y    RATIO
50    56    .1
50    59    .1
52    54    .2
500    393    .9
450    36    .7
250    190    .7

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