Euro zone central bank chiefs are likely to maintain their existing cap on a funding lifeline to Greece when they meet on Wednesday, people familiar with the matter said, keeping pressure on Greece as its lenders run out of cash. Hopes that Greece may be willing to soften its stance after a failed last-minute attempt to avert default to the International Monetary Fund will discourage the central bankers from taking more radical action, such as calling in some of the emergency funds already provided. Tightening the Emergency Liquidity Assistance to Greek banks, used to make payouts, could force Greece to lower its 60-euro-a-day limit on cash withdrawals.