<P> Much of the yelling that goes on during a curling game is the skip calling the line of the shot and the sweepers calling the weight . The skip evaluates the path of the stone and calls to the sweepers to sweep as necessary to maintain the intended track . The sweepers themselves are responsible for judging the weight of the stone, ensuring the length of travel is correct and communicating the weight of the stone back to the skip . Some teams use stopwatch timing, from back line to the nearest hog line as a sweeping aid . Many teams use the Number System to communicate in which of 10 playable zones it is estimated the stone will stop . </P> <P> Usually, the two sweepers will be on opposite sides of the stone's path, although depending on which side the sweepers' strengths lie this may not always be the case . Speed and pressure are vital to sweeping . In gripping the broom, one hand should be one third of the way from the top (non-brush end) of the handle while the other hand should be one third of the way from the head of the broom . The angle of the broom to the ice should be so that the most force possible can be exerted on the ice . The precise amount of pressure may vary from relatively light brushing ("just cleaning" - to ensure debris will not alter the stone's path) to maximum - pressure scrubbing . </P> <P> Sweeping is allowed anywhere on the ice up to the tee line, as long as it is only for one's own team stones . Once the leading edge of a team stone crosses the tee line only one player may sweep it . Additionally, when a stone crosses the tee line, one player from the other team is allowed to sweep it . This is the only case that a stone may be swept by an opposing team member . In international rules, this player must be the skip; or if the skip is throwing, then the sweeping player must be the third . </P> <P> Occasionally, players may accidentally touch a stone with their broom or a body part . This is often referred to as burning a stone . Players touching a stone in such a manner are expected to call their own infraction as a matter of good sportsmanship . Touching a stationary stone when no stones are in motion (there is no delivery in progress) is not an infraction (unless the stationary stone is struck in such a manner that its position is altered), and is a common way for the skip to indicate a stone that is to be taken out . </P>

When is the other team allowed to sweep in curling
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