When sounds within or at the end of a lexical unit are lengthened, we use <Z> (with Z standing for the German word 'Zögerung'). You can find it for prefinal lenghtening, with plosives that have a longer closure phase and in the event of an aspiration phase that is stronger or longer than normally. This label is directly added to the letter representing the sound affected.
w001_ptd_001_AAA: wann f"angt der Fi<Z>lm de<Z>nn an ?
w001_ptd_001_AAA: f"ur welche Uhrzeit<Z> gilt<Z> das ?