Christian Horner has revealed which of Red Bull's past driver line-ups were the most harmonious - and which were the least.
The team is currently benefiting from a good relationship between Max Verstappen and Sergio Perez and, whilst there have been previous pairings who have had a similar dynamic for the most part, there have been others which haven't worked quite as well.
"DC [David Coulthard] and Mark [Webber], they were reasonably harmonious," Horner told the Beyond The Grid podcast. "Mark and Sebastian [Vettel] certainly weren't harmonious.
"Daniel [Ricciardo] and Max were for the large part of it very good. They raced hard, but there was a respect between each other."
Horner believes that the positive working relationship between Verstappen and Perez - who is in his first season with the team - is working well because Perez was grateful for the opportunity at the team after being left without a seat following Aston Martin's decision to sign Vettel.
"Really since Daniel left, obviously we had drivers come in very young, and Max was running solo," Horner said. "And it's only really since Checo [Perez] has now arrived [that has changed].
"He's a great team player. He was out at the end of last year, he would have been unlikely to find a seat, certainly not a competitive seat, so I think he's enormously grateful for this opportunity, grabbing it with both hands.
"He's a really rounded guy, a lot of experience, and he's playing the team role fantastically well."
As for those past less-than-harmonious relationships - namely Webber and Vettel - Horner admits that time can heal these kinds of rifts.
"It's funny because, as time has passed, those two guys that probably hated each other at the time, they're actually good mates now," the team principal said. "It's amazing what time and perspective gives.
"But when you're in the heat of the moment, and they're competing and they've got so much at stake, you can understand how you end up in a position where there was no way Sebastian was going to sit behind and just follow his teammate."