IE laryngeals - empirical evidence

I've read that the three postulated laryngeals (e.g., for Greek),
deleted within the history of each IE language. Is there any
body of data consisting of alternations which demonstrate vowel
coloring, aspiration of stops, other innovations ascribed to
the laryngeals. If not, just how abstract are analyses which
set up ablaut series with several laryngeal+vowel secuences.