  The diagram comparing the flux ratio of the [OIII] and H$\beta$ emission
lines with the total stellar mass of galaxies (also known as the
mass-excitation diagram, MEx) has been widely used to classify the ionization
mechanism in high redshift galaxies between star formation and active galactic
nuclear ones. This diagram was mainly derived using single-fiber spectroscopy
from the SDSS-DR7 survey. In this study, we revise this diagram using the
central and integrated spectral measurement from the entire Integral Field
Spectroscopic MaNGA sample. Our results suggest that along with the physical
parameters of this diagram, the equivalent width of the H$\alpha$ emission line
is also required to constrain the ionization mechanism of a high-redshifted
galaxy. Furthermore, the location of a galaxy in the excitation-mass diagram
varies depending on the use of central or integrated properties.
