I'm super ashamed of asking such a question, but there is an abbreviation that often comes in some papers that I have to read, I have no idea what it stands for and I'm just too ashamed to ask my colleagues... so here I am on the internet to try to find an answer (obviously English is not my mother tongue so it doesn't help).
Here is a figure I found in a paper. What does the "DS" stand for?
I've been trying to find out for hours now (using google and everything) but I'm really desperate. So I'm really sorry for the dumb question... but please help me, I feel so stupid. I thought that maybe it could be "day start" but I'm not sure, so any confirmation would be very welcome... Thanks in advance and I'm really really sorry for the completely uninteresting question.
