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* Norway gas exports total 289 mcm/day * Supplies to Britain slip by 4 mcm/day OSLO, May 22 (Reuters) - Norwegian pipeline gas exports toBritain slipped on Wednesday morning, while those to otherdestinations in Europe were steady, data from gas systemoperator Gassco showed. Deliveries to Europe including Britain were down to 289million cubic metres (mcm) by 0800 GMT versus an average of 293mcm on Tuesday. Supplies to Britain, Europe's biggest traded gas market,eased by 4 mcm to 69 mcm, with flows through the 72 mcm Langeledpipeline running at 38 mcm. Combined deliveries to Germany and the Netherlands weresteady at 140 mcm. Exports to France and Belgium were alsounchanged at 43 mcm and 37 mcm. Norwegian gas output is expected to be reduced by 54 mcm perday from May 23 until July 12, due to field maintenance, butanother outage of 40 mcm per day is scheduled to end by thattime, resulting in a net reduction of 14 mcm. Analysts at Point Carbon, a Thomson Reuters company, saidboth outages are likely to be related to maintenance at thecountry's biggest gas field, Troll. Also from May 23 until June 2, gas output from Shell's Ormen Lange gas field could be reduced by 10 to 36 mcmper day due to maintenance, the analysts said. Norway's export figures are based on gas fed into the systemat a certain time and calculated to a daily average. Volumes canvary throughout the day as producers adjust the amount of gasthey pump. Following is a summary of spot price settlements at Europeangas trading hubs: Gas hub May 20 May 21 NBP 27.1/67.1 27.4/68.4 TTF 27.1 27.2 NCG 27.4 27.5 Gaspool 27.1 27.4 Zeebrugge 26.7 27.1 Peg Nord 27.4 27.5 Peg Sud 33.7 32.9 Oil-indexed price 37.26/92.18 37.26/92.18 NOTE: Prices are in euros per megawatt-hour, except for NBP andoil-indexed prices, which are also given in pence per therm. The oil-indexed price is a monthly estimate by Thomson ReutersPoint Carbon and can vary due to day-to-day currencyfluctuations. (Reporting by Nerijus Adomaitis; editing by Jason Neely)