Hello, I am loading in data from the GRIB2 files using PyNIO. Once I load them into numpy arrays I am left with a halo of values near the array boundaries that appear to be empty. When I print them or use them in conditional statements I see values of '--'. I'd like to turn these values into zeroes at the very least. As an example if I print the array I see: [[-- -- -- ..., -- -- --] [-- -- -- ..., -- -- --] [-- -- -- ..., -- -- --] ..., [-- -- -- ..., -- -- --] [-- -- -- ..., -- -- --] [-- -- -- ..., -- -- --]] though I know that there are valid values in the interior of the domain which plot properly. I can't find anything in the numpy documentation that addresses this type of missing value. Has anyone dealt with this before? Thanks, Bryan