Question about Chart-to-Text's Statista Mapping

[tannq-jo]

Hi,
In the data/statista_mappings.json file, I see that there is an underscore _ for each Statista's chart ID from the Chart-to-Text dataset. I have checked the Chart-to-Text's Statista dataset and found that its chart IDs do not contain any underscore _. Also, I try to remove the underscore _ from its chart IDs but still not be able to map these charts correctly. Could you please explain this to me?

Thank you for your attention to this matter.