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Both pre-edge and inter-edge regions have its zero nanosecond reference in the same place: the starting point of a trigger (corresponds to the beginning of the chart). That's why selecting an inter-edge with a value less than the pre-edge makes the middle region disappear. Check the diagram below to have things more clear. The post-edge zero reference starts at the end of the pre-edge or the inter-edge, which one is greater.
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The firmware doesn't work in terms of nanoseconds, but it uses clock ticks. A transformation must be done from clock ticks to nanoseconds and vice-versa. Also, the firmware doesn't accept odd values for tick counts. The first 28 bytes of the raw waveform sent by the firmware contains diagnostics data and not sampled data and have to be removed. All of these operations are described in the section "Waveform and integration windows".
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