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This is a 3D graphic represenetation of a base spark map as seen in the ACCEL/DFI Gen VII system. It plots manifold pressure, rpm, and ignition advance. The green area indicates minimal advance, yellow is slightly more, and orange/red represents between 28 and 34 degrees of total timing. The white area indicates the portion of the spark map with very little throttle opening (high vacuum/ low load), which is the reason for the higher spark numbers.