It appears that there is a 1/2 pt border between columns.
Is that correct?

If I merge 3 standard 8.43 pt width cells (A1:C1) and wrap
text, the text wrap appears to be the same as if it were
one cell with a column width 26.29 instead of 25.29.

If I go to FormatCellsBorder the line style is
represented visually, but in Word the default line style
for a table border is 1/2 pt.

Also, is I use a cell border that is thicker than default,
does that reduce the space available in the cell or
increase the spacing between cells?

Thanks for your help,
Bob