Fig. 3: Generalised graben-fissure systems (from Fig. 2) associated with the four main centres on the background of NASA Magellan SAR images.
From: Dyke swarms record the plume stage evolution of the Atla Regio superplume on Venus

Circles indicate the inferred plume head size based on the radius (R) of transition in the dyke swarms, from radiating to linear; dashed where unconstrained (see text for discussion). Additional generalised lines are shown in Fig. S7. The maximum radius of each swarm is: a Ongwuti Mons = >1100 km, b Ozza Mons = >2000 km, c Unnamed Mons = >1100 km, d Maat Mons = >1500 km.