Chemical map of the Galaxy observed by MWM. The [X/M] vs. [M/H] relations are shown for the combined α-elemental ratio as well as the single elements from Mg to Ni for the global disk sample. Red and blue curves represent the median trends of the high- and low-Mg stars separated based on their Mg abundance. This separation and the metallicity boundaries of the thick and thin disk stars are indicated by the black solid and dashed lines in the panel of Mg. Note: ⊗ drives caution to V because of the high observational uncertainty.