Secondary sources agree the sixteen calls between the two general openers and the Aethyr call work the four Elemental Watchtowers (earth, water, air, fire), but they disagree on the exact call-by-call assignment, and some later schemes (Golden Dawn) elaborate a finer subdivision (24 sub-angles) that is a 19th century systematization rather than Dee's own division. c2-esoterica declined to assign a specific element to any of the sixteen individual calls on 2026-07-27 rather than pick one scheme and present it as settled.
What would resolve this A direct reading of the relevant Sloane manuscript folios (the calls proper, distinct from Sloane 3191's Heptarchia material) cross checked against Casaubon's 1659 print, or a specialist secondary source that states its own call-by-call table and its manuscript basis explicitly.
OpenEarly modern manuscript studies / history of Renaissance magicJohn Dee, edited by Meric Casaubon, A True and Faithful Relation of What Passed for Many Years Between Dr. John Dee and Some Spirits