[R] how to plot gridded data

[lily li]

Hi R users,

I have a question about plotting gridded data. I have the files separately,
but do not know how to combine them. For example, each txt file has daily
precipitation data at a specific grid cell, named pr_lat_lon.txt. How to
plot all txt files for one surface (which is rectangular in this case), or
how to combine the txt files together? Thanks.

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