Figure 2. (Color online) Mean concentration of cerium at all sites for PMC and PMF (Error bars correspond to ± 2 SEM)

From

Cerium Levels in Coarse and Fine Airborne Particulate Matter in El Paso, Texas, U.S.A.

Fumador E.A., Amaya M.A., Brunner B., Clague J.W., Li W-W., Olvera H.A., Berwick M., Burchiel S.W., Pingitore N.E.

Journal of Atmospheric Pollution. 2019, 7(1), 1-13 doi:10.12691/jap-7-1-1