I have seen that a fourth laryngeal h4 has been posited for those
cognates where Latin or Greek has <a-> but Hittite has <a-> too (no
<ha-> from *h2e-). I would like to ask: is it possible that we could
be dealing here with *h1a-, with <a> a wholly separate vowel,
unaffected by the preceding *h1, which in Hittite appears as Ø- in onset?
Andrew