On a very slow weekend...With the summer season officially over as of last weekend’s Labor Day holiday, the US box office has slipped into a period of low-earning doldrums. With only one relatively wide new release this week – faith-based music drama The Identical, which barely blipped awareness radars and opened 11th – Guardians Of The Galaxy once more ruled an almost unchanged top 10 according to studio estimates.The Marvel movie, now cemented as the highest-earning domestic release of 2014 so far, enjoyed a fourth (third consecutive) weekend at the top of the charts, adding $10.1 million to its coffers for $294.5 million in the US so far.