Swelling (1 of 4)
Semi-abducted position, standard light.

Swelling (2 of 4)
Pre-phonatory instant. Standard light shows only the suggestion of margin swelling, as the dark space between the cords is not exactly the same along its length.

Swelling (3 of 4)
Open phase of vibration. Strobe light shows both wide excursions (indicating mild flaccidity) and margin swellings.

Swelling (4 of 4)
Closed phase of vibration, strobe light. Shows margin swellings more clearly.