CMD for Stock 2, NGC 1960, and FSR 866 open cluster based on stars with the membership probability P ≥ 0.95 for Stock 2, NGC 1960 and P ≥ 0.985 for FSR 866. Colors are preliminarily dereddened. Parameters are as follows (DM_G is the distance modulus in the Gaia filter G). Stock 2: ﹩\mathrm{log}(\mathrm{Age}/\mathrm{yr})\,=\,﹩ 8.5, E(B − V) = 0.336, DM_G = 9.2 mag, Distance = 463 pc; NGC 1960: ﹩\mathrm{log}(\mathrm{Age}/\mathrm{yr})\,=\,﹩ 7.48, E(B − V) = 0.27, DM_G = 11.1 mag, Distance = 1202 pc; FSR866: ﹩\mathrm{log}(\mathrm{Age}/\mathrm{yr})\,=\,﹩ 9.57, E(B − V) = 0.05, DM_G = 10.75 mag, Distance = 1331 pc.