It leaves them just five points above the danger zone with four games to go following the weekend draw with Reading.
Cobblers end the season with games against Charlton, Shrewsbury, Crawley and at home to Wigan on the final day.
At the other end of the table Wycombe kept up the pressure on Wrexham with a victory to pull to a point behind the Welshmen.
Leyton Orient also pulled two points back on Reading in the final play-off place, while Bolton and Huddersfield slipped up.
So who is going up and down? Here is how a supercomputer – produced by footballwebpages.co.uk – thinks the season will finish.
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