Re: 'dyeus'

In an earlier post in this discussion thread I had written:

> Proto-Indo-European *deih2- 'to shine' --> Proto-Indo-Iranian
> *daiH- (where /H/ = an indeterminable laryngeal phoneme) 'id.' -->
> Sanskrit dayI- (where, as I believe, /I/ denotes labialisation of
> the preceding phoneme) 'id.'.

Could someone explain to me what the phonetic notation 'raised /i/' (after an /y/), used by Lubotsky, f.i., in the following link:

http://tinyurl.com/2bpsunl

stand for? It is something peculiar to his own transcription of Sanskrit roots, but I am not sure as to whether it denotes labialisation of the /y/ (as I wrote in the above quoted message of mine) or not.

Thanks and best regards,
Francesco