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You cannot do that.

The reason is that when you just flip the z-axis you will transform a right-handed into a left-handed coordinate system, thus not having a simple euclidian transform, but actually a mirroring.

The other question would be: Why do you want to do that? Judging from the name, you just want a base link to laser transform, which shouldn't require this. Maybe you just got the wrong idea about how you want to transform?

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