By Deepa Babington ATHENS (Reuters) - Thousands of Greeks worried about the prospect of crashing out of Europe's currency union rallied in Athens on Tuesday behind a "Yes" vote in a referendum on whether to accept tough terms demanded by creditors to keep the country afloat. Tsipras called a referendum on the creditors' offer for July 5, and has told Greeks to vote 'no'. While many Greeks believe the creditors' demand of tax hikes and pension cuts would harm a country suffering from one of the worst economic depressions of modern times, others fear rejection of the offer could set in chain an even more damaging departure from the common currency.
