Well, I deleted the width="nn" clauses in the cells, and now everything is ok (no vertical borders).
But I needed these clauses, because inside some cells, I repeated a thin .bmp band to form a wider horizontal band.
Otherwise, I'd've just splashed the whole damn picture ! But, I was trying to reduce image size. Wasn't that thoughtful of me ?
Why .bmp and not .jpg ? Because over the band there are superimposed some other drawings, and the band has a pure color, which .jpg turns into small, irregular, ugly variations of the same color. And also, one drawing is larger than the band itself, both above and below the band.
Mikey
