Scatterplot - unexpected symbol error and multiple samples

Yes, this is a non-syntactic variable name, if you want to use it you have to enclose it among backticks. `BMD1 Blue pGAP Sec3`

We like to keep things tidy around here, if you have different questions, please ask them on separate topics providing a proper REPRoducible EXample (reprex) illustrating your issue.