You might be better experimenting with creating a JPG of the table and inserting that as a high res graphic.
Thanks for responding. I copied the table to a separate text box and went to the object export box, and rasterized the container as 300 dpi., and set it relative to text flow but upon export the chart appears small in iBooks and gigantic in Kindle Previewer, and large and distorted in Calibre. I'm going to try setting it to text size but I'm thinking that's not going to be much different. Any other thoughts? Thanks again.
Try saving the table as a PNG or JPG.
Try the following table and css code. I have attached an epub which you can open in Sigil.
It is based on the epub table code here:
As for the 300ppi image: NEVER DO THAT in InDesign's mobile device templates. InDesign works at the device's native pixel/screen resolution when rasterizing at 72ppi. More is only necessary if you want your reader to be able to zoom in further.
Thanks, Rayek! I'm totally new to coding so I may have questions for you. My apologies in advance.