I'm about to buy some curtains from Dunhelm Mill online. I've selected ny fabric, entered my measurements etc. The track on my window measures 300cm wide and the drop is 143cm. I have a really stupid question though. When I go to my basket, it's showing quantity of 1. Is that 1 pair of curtains, each measuring 300cm wide and 143cm drop, or 1 single curtain? I made an expensive error before re curtains, so really want to get this right!