(W_{RP, BP−RP} − W_{Ks, J−Ks}) vs. K_s diagram of Gaia DR2 LPVs in the LMC. The markers are colored with G_BP − G_RP according to the color-scale shown on the right of the figure. The solid line delineates O-rich (left of the line) and C-rich (right of the line) stars, and dashed lines delineate sub-groups as indicated in the figure. The definition of the borderlines are given in Appendix A.