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* Norway pipeline gas exports at 258 mcm/day * Maintenance to reduce output later this week OSLO, May 20 (Reuters) - Norwegian gas exports held steadyon Tuesday, a day after dropping when rising temperatures denteddemand across northwest Europe, data from gas system operatorGassco showed. Warmer weather and healthy supply pushed British within-dayprices down to a 3-1/2 year low on Tuesday. Some support toprices could come from a planned cut of Norwegian deliverieslater this week. The 48-hour maintenance period on May 21-23 is expected toreduce gas output by 35 million cubic metres (mcm) per day,preceding a planned outage of 60 mcm per day on May 23-29. The volume indicates the later is likely to be at RoyalDutch Shell's Ormen Lange field, Norway's secondlargest. The following table shows Norwegian pipeline gas flowsmeasured in mcm/day compared with the previous day's closinglevel: Destination Real time Pvs session Change (mcm) Britain 45 49 -4 Germany & Netherlands 146 145 1 France 26 25 1 Belgium 41 40 1 Total 258 259 -1 NOTE: Pipeline gas export figures are based on gas fed into thesystem at a certain time and calculated as a daily average.Levels can vary throughout the day as producers adjust theamount of gas they export, according to changing nominations, ororders, from customers. Following is a summary of spot price settlements at Europeangas trading hubs: Gas hub May 19 May 16 NBP (UK) 18.6/44.4 18.5/44.2 TTF (Netherlands) 18.7 18.9 NCG (Germany) 19.2 19.2 Gaspool (Germany) 19.2 19.0 Zeebrugge (Belgium) 18.9 18.8 Peg Nord (France) 19.3 19.5 Peg Sud (France) 24.6 24.6 Oil-indexed prices* 28.85/30.83/34.26 28.85/30.83/34.26 NOTE: Prices are in euros per megawatt-hour, except for NBP(euros/MWh & p/th). The oil-indexed price for Russian gas is anestimate by Thomson Reuters Point Carbon. * The oil-indexed prices mentioned above are in order:Russia spot-indexed gas/Russian oil-linked discountedgas/Russian outright oil-indexed gas. (Reporting by Nerijus Adomaitis, editing by David Evans)