Thousands of people meet in the centre of Santiago for the closing of the "yes" campaign for Chile's constitutional plebiscite, while "no" supporters opt for a more sober gatheting on San Cristóbal hill. Chileans will vote Sunday on whether to adopt a new constitution that would replace the current one, written during the Augusto Pinochet dictatorship, that -- despite several successive reforms -- is still considered an obstacle to any fundamental social changes. IMAGES AND SOUNDBITES