You could certainly do that, but if we take a step back, we need to ask the question - why are they significantly different. If they are the same build, they should be close - close enough for this graph. Yes, there can be small differences based on the hw used. But significant?
Personally, I would not want to pollute my tree with duplicate people that have just DNA test differences.
You can submit a Feature Request to address this Legend issue.
Gary
I agree with you about duplicate people bad enough keeping track of all
the ones that are real or speculative.
Do not see the need for a Feature request cannot say it is a major
enough issue to take up anybody’s time others may think differently
The more I go into this the more aware I am of the “tweaks” each company
that tests and or publishes the DNA results must make for their own purpose.
I think the term “significant” has different interpretations in this
case I am talking a change from 20cM to 40cM
Thanks for your input
phil
When I create an Association, I share the Citation. So I have exactly 1 Citation for all GEDmatch matches, 1 for FTDNA, …
If this is what others do, then we could limit the view of the DNA Segment Map to only a specific source.
Thoughts on whether this has value?
How would you adapt the Legend/ColorKey if there were multiple Sources? (each for a different service)
Users would probably want the rows grouped in the list. Maybe use the same color but different fill patterns for each secondary source?
I was thinking as an optional Filter. Only specific Citation would be in the graph.
But if users don’t share Assoc Citations always, this won’t work. And I suspect people don’t. I checked my 100+ Associations and I am even guilty of not doing it every time.
I think this is not a viable option due to requiring citation sharing.
That would align nicely with the tutorial project for adding a Custom Filter option to Gramplets.
Maybe you could help us make the example more comprehensive… then find out where it falls apart when being applied to your real-world gramplet.
I was thinking of an interface to specify the Citation ID from a text type-in. I was not thinking of a traditional Filter.
But this idea is dead.
Resurrecting this thread just to say that I’ve gotten around to making a wiki page for this gramplet on the wiki: Addon:DNAMatches - Gramps
I’ve also made a new pull request targeting Gramps 5.2 (the previous PR was for 5.1): New Gramplet: DNA matches (Gramps 5.2) by RampantSpirit · Pull Request #613 · gramps-project/addons-source · GitHub
Forgot to post here, but the addon has been merged and is now available on both Gramps 5.1 and 5.2! 
Has DNAmatches been validated for 6.0?
Yes, it works fine in gramps 6.0
Can someone please explain to me how to use the DNA Match Gramplet?
I’ve installed the gramplet in the People view.
How and for whom do I enter the DNA data?
I probably have to start with the person who took the DNA test, e.g., on MyHeritage. Then I have to create an attribute called DNA. Then do I have to enter something in the notes? I don’t quite understand that yet…
Lets assume you had a DNA test at MyHeritage (or FamilyTreeDNA or …) You get your data and a list of matches.
The DNAmatches gramplet lists out all of the match data that you entered into gramps for the active person. To do that you have to enter the data into Gramps.
The active person is the person who took the test. Go to MyHeritage → DNA Matches → Chromosome Browser (Advanced Options) and Download Shared DNA data.
Now you have all of the shared data that you will upload to Gramps. Look at the CSV file and you will see two names (first your name, then the match name) and then the chromosome info (Chromosome,Start Location,End Location,Start RSID,End RSID,Centimorgans,SNPs)
Make an Association of type DNA with the match name. Create a Note that contains the chromosome data for that person (may be multiple lines). Do not include your name or the match name in the Note. The start of a sample Note would be:
1,752566,68120163,rs3094315,rs658634,96.7,36992
1,76532848,154721780,rs1251472,rs6698628,60.6,26240
1,191577392,216618220,rs2050664,rs12059468,29,13440
1,226539909,249222527,rs35709863,rs114152372,42.5,14463
Now remove the two fields that have rs in them (these are extra fields that MyHeritage provides, but gramps does not need). The result is
1,752566,68120163,96.7,36992
1,76532848,154721780,60.6,26240
1,191577392,216618220,29,13440
1,226539909,2492225272,42.5,14463
You can add Associations for each match person.
Now if you run the DNA matches gramplet, you will get a list of all of the DNA match data. If you run the DNASegmentMap gramplet, you will get a view that is similar to the Chromosome Browser.
Feel free to update the wiki page Addon:DNAMatches - Gramps to make better.
Great, thank you very much.
I needed instructions like these.