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What do you mean that nothing appears in rxgraph?

One thing to try would be to try using standard subscribers for your topics and make sure you're getting messages coming in. Once you verify that you are indeed getting messages, check to make sure that there are messages on each topic with identical timestamps. If there aren't, you should either change something wherever your messages are being produced to ensure they're actually synchronized, or switch to an ApproximateTime policy.

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