Color diagram of the pattern of flow of activity for the five second interval of seizure EEG. Each circle within the rectangle corresponds to the respective subdural grid contact. Connected circles representing depth contacts are shown in the row above the grid. The width and color of arrows are proportional to value of IDTF for respective contacts. The relative color scale is shown below (red is the greatest flow; blue is the arbitrary threshold flow below which arrows are not shown for clarity). In this illustration contact T10 is the main source of flow in the frequency bandwidth 4.5-5.5 Hz; T19 also is a significant source.