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I perform a high precision measurement of the static quark-antiquarkpotential in three-dimensional ${\rm SU}(N)$ gauge theory with $N=2$ to 6. Theresults are compared to the effective string theory for the QCD flux tube and Iobtain continuum limit results for the string tension and the non-universalleading order boundary coefficient, including an extensive analysis of alltypes of systematic uncertainties. The magnitude of the boundary coefficientdecreases with increasing $N$, but remains non-vanishing in the large-$N$limit. I also test for the presence of possible contributions from rigidity ormassive modes and compare the results for the string theory parameters to datafor the excited states.

Spectrum of the open QCD flux tube and its effective string description