Gaia DR3 parallaxes of our sources in comparison to those of the O stars in the region (gray). The vertical thick and thin lines correspond to the 1σ and 3σ uncertainty in the parallax measurement. The horizontal black line shows the parallax at 1/1.663 mas corresponding to our determined mean distance and the dashed black lines show the parallax of the interval at [1/1.763, 1/1.563] mas.