In most cafés in Sweden the påtår is free of charge. If the menu doesn't state clearly sth like "Påtår 5 kronor" (Second filling of coffee SEK 5) you can have an extra cup. Or ten. Unless it's stated "Endast en påtår" (One påtår only) of course. There are, somewhat jocular, words for the third cup, the fourth etc ("tretår", lit. three tear, "fyrtår" liit. four tear; tår in itself a jocular way of describing a small amount of coffee). Tl;dr Påtår, the second cup of coffee. Usually free of charge.