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Though odds offered by betting websites and bookmakers point towards a vote for Britain to remain in the EU, polls have not offered a clear picture of what the outcome of the June 23 ballot might be. Investors worry that a Brexit would weigh on the economies of not just Britain, but the rest of Europe too.
The Swiss franc climbed 0.2 percent on the day to 1.0903 francs per euro on trading platform EBS, its strongest since April 19.
The yen, another safe-haven currency, also climbed sharply, hitting a more-than-three-year high against the euro.