Data Table: line-height with images?


I have included images in a Data Table, by setting the column to markdown:

columns.append({'name':'Col1', 'id':'Col1', 'presentation':'markdown'})

However, I then find that there is a large padding above and below the image! I think it is line-height. Changing lineHeight in style_data and style_cell has no effect.

Does anyone know a solution? (I can upload example later if that would help?)