Okay, well, I fell off the horse a few weeks, but I'm back! Let's continue with wallpaper groups. Tonight's pattern is cm:
|an axis of reflection.|
|an axis of glide reflection.|
Image and Key: Source: Wikipedia
I can't find my stylus, so I'm drawing in illustrator with the mouse. Here's the basic half-cell.
Here's the cell after the reflection. The black lines are just to show structure.