Hi all,

quick question (Python 3.8.8 via Anaconda, pygplates rev 28, py 3.8, win 64) :

```
lons = np.array([-2, 2, 2, -2,-2])
lats = np.array([ 2, 2 ,-2,-2, 2])
pygplates.PolygonOnSphere( zip(lats, lons) )
```

doesn’t work - complains about `TypeError: Expected a sequence of points`

, strangely as it is given here as example

```
lons = np.array([-2, 2, 2, -2,-2])
lats = np.array([ 2, 2 ,-2,-2, 2])
pygplates.PolygonOnSphere( list(zip(lats, lons)) )
```

doesn’t work - also complains about `TypeError: Expected a sequence of points`

, despite `type(list(zip(lats,lons)))`

being `list`

.

```
points = []
points.append((-2, 2))
points.append((2, 2))
points.append((2, -2))
points.append((-2, -2))
points.append((-2, 2))
pygplates.PolygonOnSphere( points )
```

works, `type(points)`

yields `list`

as above.

Am I missing something?

Cheers,

Christian