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The gap continues to narrow between voters on both sides of the referendum debate, a poll suggests.
The lead held by the Better Together campaign for a No vote in September has shrunk from 19% in September to 12% in the latest survey, according to pollsters TNS.
The poll of 988 people found the No vote has dropped one point to 41% compared with 29% for independence, which is up one point from February. Among those certain to vote, 33% will back independence, up one point, compared with 46% of people who say they will vote against independence.
The number of people who say they are certain to vote has increased to a high of 74%, up from 65% in September.
Tom Costley, head of TNS Scotland, said: "The increase in the proportion who claim they are certain to vote is an indication that more and more people are realising the importance of this referendum and are becoming increasingly engaged in the process.
"This survey shows that while many voters are now committed to one side or the other, a significant proportion of voters still have to make up their minds. Many undecided voters are telling us that they will definitely cast their vote, and how the campaigns address their interests is likely to have a big influence on the final outcome.''