Hi @idefix37 and thanks for your quick answer !
Yes that's what I was thinking for the website, missing values means 0 m.
My question is then why the API is giving a different value for the same location and same timestamp ?
Here is my API call code :
Capture d’écran 2023-04-11 à 14.17.39.png
And here is the result (I reduced it to get the last timestamp on the one we want 1681257600 (04-12 00:00 UTC) :
Capture d’écran 2023-04-11 à 14.25.38.png