Using a standardized format, the FO sends either an absolute position or a position relative to another point, a brief target description, a recommended munition to use, and any special instructions, such as "danger close" (a warning that friendly troops are close to the target, requiring extra precision from the guns). Firing begins with an adjustment phase where only a single gun fires, and if the rounds are not accurate, the FO will issue instructions to adjust fire in four dimensions (three spatial and one temporal). When the degree of accuracy is acceptable, the FO will then typically call "fire for effect", unless the objective of that fire mission is something other than suppression or destruction of the target. A "Fire For Effect" or "FFE" calls for all of the guns or tubes to fire a round.