# set up two textab blocks:
block1 = TexRow(c("hello","world","block"))
block2 = TexRow(c(5.081, 2.345, 6.789), dec=1)
# add a full midrule between the two blocks
block1 + TexMidrule() + block2
# add a partial midrule to the first column and spanning the second-third columns:
block1 + TexMidrule(list(c(1,1), c(2,3))) + block2
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