Projected density distribution of likely Gaia DR2 members in cluster field. The red circles are the observed values together with their Poisson errors. The blue line shows the fitted King profile from which we obtained both the core (r_c) and the tidal (r_t) radii. Their positions are indicated with vertical dashed lines. The background density (0.15 stars arcmin⁻²) is also represented as a horizontal dashed line.