METALS-LME copper slips for fourth day ahead of Fed meeting

BEIJING, March 20 (Reuters) - London Metal Exchange (LME) copper prices lost ground for the fourth session on Tuesday, tracking a fall in equities as investors trimmed positions ahead of a Federal Reserve meeting starting later in the day, while the dollar edged upwards. A stronger dollar makes metals more expensive for holders of other currencies and can weigh on prices. FUNDAMENTALS * LME COPPER: Three-month copper on the LME had fallen 0.3 percent to $6,836 a tonne