# Review and edit constraints

<figure><img src="/files/CZY0nil8q9JfDC0OS14R" alt=""><figcaption></figcaption></figure>

## Computed Constraints

### Differential Pairs

Based on the parameters from your stackup, Quilter uses Simbeor to calculate the correct trace width on each layer. Currently the frequency is assumed to be 1 GHz.

<figure><img src="/files/xR0WHQa76fNofYt0rbpe" alt=""><figcaption></figcaption></figure>

### Power Nets

For each net and current you defined on the previous Comprehensions page, Quilter calculates the appropriate trace width to limit temperature rise to 20\*C, using the IPC-2221 definitions.

<figure><img src="/files/FRgvPib0aWTm8W8fLPXU" alt=""><figcaption></figcaption></figure>

## Define your own constraints

<figure><img src="/files/9NCNUOegzfuQZq7KqKq6" alt=""><figcaption></figcaption></figure>


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