Uwe,

what if you change the E in each equation with N?  You'll get 0 entries
when the calculations involve all empty cells which might not be what
you want, of course.
-- 
: Eric S Fraga via Emacs 28.0.50, Org release_9.4.6-566-gf0198e
: Latest paper written in org: https://arxiv.org/abs/2106.05096

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