The four rows of a geomantic figure, each holding one point or two, are the whole of the figure. Sixteen such arrangements exist and no seventeenth is possible.
The pattern
Coniunctio is double, single, single, double, reading Fire, Air, Water and Earth from the top down, six points in all. Heavy rows sit at the top and the bottom with two light rows between them.
Flipping every row
Change each row from single to double and from double to single and Coniunctio becomes Carcer. The two are worth drawing side by side, because their shapes are complementary in the most literal sense available in this system: everywhere one has a single point the other has a double, and the pair between them accounts for every position twice.
Meeting and holding
Coniunctio is read as meeting, joining and the coming together of two things, and Carcer as confinement and a matter held in place. The tradition does not present these as opposites, and the atlas does not either. The relationship recorded above is between the point patterns; whether it means anything for a reading is a question the Latin handbooks answer differently and mostly do not answer at all.
The attributions
A planet, a sign and an element are recorded for Coniunctio elsewhere in the atlas. They come from the astrological tradition that was attached to the figures in Latin Europe, they differ between Agrippa, Cattan and the later English handbooks, and they were not derived from the rows.