That chart shows emissions per kilogram of food product. The absolute numbers are higher for rice because the world produces much more rice than coffee - about

That chart shows emissions per kilogram of food product. The absolute numbers are higher for rice because the world produces much more rice than coffee - about 10 million tons for coffee and 500 million tons for rice. That would put the absolute emissions from rice about 8 times higher than coffee (225 vs. 29 including methane emissions).