Hi Alex,
Good to see you. The tissue-corrected estimates are in ‘institutional units’, which is the term used for ‘attempt at arriving at molal concentrations’ (see a bit of a discussion here) because spectroscopists have not been able to agree on a single universally-agreed-upon method to do that.
280 for Glu seems very far off, but I have an idea what’s going on there. a) is that the CMRR sequence from Dinesh Deelchand and b) when was the last time you updated Osprey? That sequence stores the TE (30 ms) in an array of sub-echo times (something like [10 12 8]), but our TWIX reader used to only ever look for one TE value and therefore only extracted the first one. It was fixed in this commit to the develop branch. With the correct TE value, the relaxation correction should get you much closer to a reasonable estimate.