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According to https://github.com/DSAureli/Steins-Gate-Anime-OST-List it is "Farewell (strings only)". I didn't find it in the albums I know about and in my experience they often used versions of tracks without ever releasing them. You could try searching it on YouTube.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.