WASHINGTON — Although the Basel Committee on Banking Supervision provided clarity on new international capital standards this weekend, the panel left some crucial questions unanswered, including how it plans to calculate certain requirements for the most systemically risky institutions.

The board of governors and heads of supervision, which oversee the Basel Committee, outlined a plan that would effectively raise common equity standards to 7% by 2019, but made it clear it is weighing extra requirements for the largest banks. Although it said it planned to use a combination of "capital surcharges, contingent capital and bail-in debt," the panel provided little to no guidance on how it will do so.

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