Sorry, I didn't realize I could improve presentation by using Courier new. Here's the grid table again:

+--------+:------------:+-------------+--+:--------------:+-------------+
|        | Heading 1    |             |  | Heading 2      |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        | A |    | B   | Q           |  | C  |      | D  | Q           |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| T      | 1 |    | 121 | 61          |  | 49 |      | 64 | 56.5        |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| U      | 1 |    | 121 | 61          |  | 49 |      | 64 | 56.5        |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| V      | 2 |    | 22  |             |  | 14 |      | 16 |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| W      |   | 12 |     |             |  |    | 15   |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| X      | 1 |    | 121 |             |  | 49 |      | 64 |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| Y      |   | 61 |     |             |  |    | 56.5 |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+

On Saturday, September 16, 2023 at 1:10:01 PM UTC-5 Paul Kelleher wrote:
I cannot figure out why I am able to center "Heading 1" over the A and B columns but not "Heading 2" over the C and D columns: 

+--------+:------------:+-------------+--+:--------------:+-------------+
|        | Heading 1    |             |  | Heading 2      |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        | A |    | B   | Q           |  | C  |      | D  | Q           |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| T      | 1 |    | 121 | 61          |  | 49 |      | 64 | 56.5        |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| U      | 1 |    | 121 | 61          |  | 49 |      | 64 | 56.5        |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| V      | 2 |    | 22  |             |  | 14 |      | 16 |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| W      |   | 12 |     |             |  |    | 15   |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
|        |   |    |     |             |  |    |      |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| X      | 1 |    | 121 |             |  | 49 |      | 64 |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+
| Y      |   | 61 |     |             |  |    | 56.5 |    |             |
+--------+---+----+-----+-------------+--+----+------+----+-------------+

I'm attaching the output (not sure how else to include it here). But you can see what I mean if you copy/paste the above into pandoc.org/try, and then process with: 

pandoc --from markdown --to latex --standalone --no-highlight

Thanks for any guidance you might have!

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