The top figure shows a geologic area and the seismic survey over that area. Red symbols represent sources, and yellow symbols represent receivers needed to conduct that survey. There are two wells: the left well is injecting CO2 in this area and the right well is monitoring the underground CO2 flow. The bottom figures show the CO2 plume overlaid over two different permeability models. Since permeability is the parameter which defines the ease of flow of any fluid in the subsurface, we can see shape of CO2 plumes are different in the bottom left and right figures. This figure also signifies the importance of monitoring CO2 storage projects because in the bottom right figure we can see that CO2 plume is almost breaching the storage complex which is undesirable for the regulators.