Fraction, f_M(a_b), of planet-hosting stars that have a stellar companion in a given semi-major axis range. The blue histogram corresponds to the whole population of planet-hosting binaries, while the green one was computed for systems at a distance of less than 500pc. Values of f_M(a_b) were calculated by dividing the number of systems in each a_b bin by the total number (or the total number at d_b ≤ 500 au) of planet-hosting stars found in the https://exoplanet.eu/ database. The black segments represent the multiplicity fraction distribution for the canonical binary distribution of Raghavan et al. (2010). We note that contrary to Fig. 1, here the Raghavan et al. (2010) distribution has not been normalised, and thus it allows for direct comparison to our database.