NIKA 150 GHz polarization observations of the Crab nebula and its spectral energy distribution (<i>Corrigendum</i>)

A computational error has been found in the formula used to convert polarization angle values from equatorial to Galactic coordinates as reported in Table 2 of our original article. This concerns only ?gal values in parenthesis, regarding the NIKA camera observations. An updated version of Table 2 is given in Table 1 with new values having been recomputed. The bottom panel of Fig. 6 of the original article has been updated accordingly (see Fig. 1). This correction, however, does not significantly affect the result of the weighted-average polarization angle, which is now equal to -87.8? instead of -87.7? , which is consistent within the uncertainty previously given. It is important to notice that the uncertainties associated with the polarization angle values are not affected by the coordinate change correction.