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We compare the predictions of the effective string description of confinementwith a set of Montecarlo data for the 3d gauge Ising model at finitetemperature. Thanks to a new algorithm which makes use of the dual symmetry ofthe model we can reach very high precisions even for large quark-antiquarkdistances. We are thus able to explore the large R regime of the effectivestring. We find that for large enough distances and low enough temperature thedata are well described by a pure bosonic string. As the temperature increaseshigher order corrections become important and cannot be neglected even at largedistances. These higher order corrections seem to be well described by theNambu-Goto action truncated at the first perturbative order.Comment: 49 pages, 8 figures. Added a section on the performances of the  algorith

String effects in the 3d gauge Ising model