By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks trudged higher Wednesday, but gains were small after a run of six straight wins for the region's equity benchmark.

The Stoxx Europe 600 index picked up 0.1% to 336.71, a mild rise after strong advances for regional stocks in the previous session that were supported by upbeat manufacturing readings from the euro zone and the U.S. The index on Tuesday closed up 0.6%.

Stocks remained thinly higher after Eurostat's report that producer prices in the euro zone fell in February, by 0.2% on a month-over-month basis, as energy prices declined. In an annual comparison, producer prices fell 1.7%, meeting median expectations.

Deflationary threats to the euro zone increase pressure on the European Central Bank -- which meets Thursday -- to act in an effort "to stimulate the economy and tackle the issue of deflation head on," said ETX market strategist Ishaq Siddiqi, who added in a note that earlier this week, harmonized inflation for the euro zone fell.

Among the sharpest stock decliners on Wednesday was Deutsche Boerse AG , down 2.5% as the German exchange operator said its Clearstream Banking unit is subject to a criminal investigation in the U.S. related to alleged violations of money laundering and Iran sanction laws.

France's CAC 40 was down less than 1 point at 4,426.47, easing back from gains Wednesday when the index logged its highest closing level since September 2008. Pressure on Wednesday came in part from steelmaker ArcelorMittal . Its shares were dragged 1.7% lower after a ratings downgrade to neutral from outperform at Credit Suisse, "based on lack of earnings momentum, cycle risk and valuation."

The U.K.'s FTSE 100 strengthened by 0.2% to 6,669.78, led by mining stocks and Marks & Spencer PLC after a report the retailer has plans to expand.

Germany's DAX 30 index rose 0.1% to 9,613.91, aided by a 3.8% gain in shares of Deutsche Post AG following a projection of earnings growth from the logistics and mail company.

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