The graph illustrates the relationship between pressure and time, depicting two distinct lines representing PS and PP conditions. The horizontal x-axis indicates time in seconds, ranging from zero to eight, while the vertical y-axis shows pressure in megapascals, spanning from zero to sixty. The PS line is shown in a lighter shade, while the PP line is in a darker shade. The graph captures rapid changes in pressure following initial spikes, followed by gradual decreases, highlighting the dynamics of both pressure profiles over the specified time frame.