Left: Erupting prominence on 2010 August 1 seen in 304 Å images from EUVI B (left) and A (right) on board the twin STEREO spacecraft. Observation times in UT are shown for each image. The features used for reconstruction are marked and numbered along the prominence legs. Right: heliographic coordinates of different features of the prominence on 2010 August 1. Features 1–5 are from leg L1, while features 6–9 are from leg L2 of the prominence (adapted from Joshi & Srivastava 2011a).