Geez... This is Pink Floyd, not the Mahavishnu Orchestra, King Crimson or Stewart, Holdsworth, Berlin and Bruford. So analyze it as much as if you just had some LSD-25. 🤪 Don't overthink, man. Feel it.
Many moons ago, as musical director this is what I told the guys in the PF tribute band to play :
a) Em9 , A7
b) CM7, Bm7, FM7, G7, D7#9, Cm/D#
The last chord in the studio LP was a Cdim/D#, but I always found it imperfect/boring compared to sound a G (Cm) instead of a F# (Cdim) in the transition before the return to Em. So emphasizing the lower RH notes in the original (Cdim/D#), you get F#, then F# then G once back to Em. With Cm/D#, you get F#, then G and G back to Em. So it develops more gradually to the Em return. Remember Pink Floyd is the minor chords everywhere band. In DSOTM, Wright insisted a few weird chords should be heard here and there (remember that other unusual Us and Them chord), but besides that, it's back to the PF basics.