| Change in (i, j, k, m) | Contact map C | Contact map D |
|---|---|---|
| (+1, 0, +1, 0) | align column i | align column k |
| (0, +1, 0, +1) | align row j | align row m |
| (0, 0, +1, 0) | gap at column i | |
| (0, 0, 0, +1) | gap at row j | |
| (+1, 0, 0, 0) | gap at column k | |
| (0, +1, 0, 0) | gap at row m |
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