A comparison is given of the various recently published extractions of the
Sivers functions from the HERMES and COMPASS data on single-transverse spin
asymmetries in semi-inclusive deeply inelastic scattering.Comment: Contribution to the proceedings of "The International Workshop on
Transverse Polarisation Phenomena in Hard Processes" (Transversity 2005),
Villa Olmo (Como), 7-10th. September 200