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Thank you for all of your replies. I also like txfonts \underbrace best. Unfortunately, I do not like its integral sign... but since the problem vanishes after printing I can relax a bit.

Dear All,

I am struggling a bit with \underbrace command. I have noticed that if \underbrace is under a long term it gets broken into pieces and the "junctions"(?) are not very smooth.

This problem is not present when I include txfonts package where \underbrace is overridden. However, with txfonts ...