Why don’t you use markdown?
| quantity | dimensional formula |
|---|---|
| period p | L^0 M^0 T^1 |
| length of string \ell | L^1 M^0 T^0 |
| quantity | dimensional formula |
|---:|:---|
| period $p$ | $L^0 M^0 T^1$ |
| length of string $\ell$ | $L^1 M^0 T^0$ |
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