Author has published a graph but won't share their results table I am trying to reproduce some of the results in a paper from 2018 where the results were included in a graph but no exact values were given. There is no results table to go with the graph. I can't exactly compare what I produce with my guesses as to what the values in the graph are. They also did not specify one of the parameters used to produce the results.
I have emailed the authors multiple times and they keep ignoring my question about sharing these values with me and apparently do not have the parameter values as they don't have the logs any longer. I am unsure how to proceed with this. It's a paper published in a high-impact well respected journal.
Any help or guidance would be appreciated. I am not being rude or brash about the way I've asked for these results. I just explained I want to compare to them and can't use the graph because I need some level of accuracy.
There is no results table to go with the graph.

Use Datathief: https://datathief.org/
Despite the name, in most countries using Datathief is explicity allowed by copyright law.  Data cannot be copyrighted.

They also did not specify one of the parameters used to produce the results.

Two possibilities: it does not actually matter or peer review has failed.  When it is your turn to peer review, check for this type of mistake.  Sorry I cannot not help in this situation.
Paper authors can choose not to answer their email if they wish.