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I've seen a lot of discussion involving z redshift when it comes to determining whether something is a merger or not. My questions are these:Is there a way to analyze z redshift prior to finishing our classification in the zoo? It seems like we just have to guess whether something is a merger or not, finish our classifying, and then check out the SDSS data once we're done. Edit - Answered by Tom in another threadIf there is no spectrum data for a given galaxy, I can't seem to find a z redshift value. Is there a place I can find it, or is there just no data available? How do you tell if there's a merger happening if there's no z redshift data? Best guess based on the shape/disturbance/etc.?Thanks for your help! Sorry if these questions have already been answered somewhere before; if they have, just a link to that post will be fine