The latest poll on independence suggests a three-point swing from the Yes camp to No in four days.
The YouGov poll for the Scottish Sun and the Times puts Yes on 48%, down three points, and No on 52%, up three points.
It marks a reversal in the fortunes for pro-independent campaigners, since the same polling organisation gave Yes a 51-49% lead over No in the Sunday Times.
The breakdown in both polls exclude voters who say they are undecided, still potentially a group who could tip the balance next Thursday.
Since Sunday, two other polls have been published: TNS produced the result of Yes and No both on 41%, with 18% saying they were undecided; while Survation for the Daily Record found Yes 42% against 48% for No, with 10% undecided.
Those polls, and tonight's, suggest that Sunday's YouGov survey may be seen as an outlier, although it could also be that the intense bombardment of warnings from business leaders, banks and the fall on the financial markets have had an impact since Sunday.
YouGov now say opposition to independence is strongest among young and old Scots. Over 60s show No 64%, Yes 36%. And 16-24 year olds are also now rejecting breakaway: No 53%, Yes 47%.
Support for independence is greatest among 25-39 year-olds: Yes 60%, No 40%.
YouGov have also discovered Alex Salmond's trust rating is down four points since September 5: 42% to 38%. Gordon Brown's trust rating is up from 32% to 35%.
Despite the swing,Yes Scotland Chief Executive Blair Jenkins said tonight: "At 48% for Yes, this poll confirms that the referendum is neck and neck - we are in touching distance of success next Thursday, and there is everything to play for. It will spur on everybody who wants and is working hard for a Yes to redouble their efforts.
"As we say in response to all the polls, we are working flat out to ensure that we achieve a Yes vote, because it's the biggest opportunity the people of Scotland will ever have to build a fairer society and more prosperous economy."
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