By Amanda Cooper LONDON (Reuters) - The leading share index was little changed by midday on Friday, as gains in the banking sector after Royal Bank of Scotland's (RBS.L: ) results were offset by losses in the miners and index-heavyweight Vodafone (VOD.L: RBS was one of the top gainers on the FTSE 100 .FTSE after the company reported one of the largest losses in corporate history, but the loss was not as large as many in the market had feared, which sent the stock up 3 percent. At 11:43 a.m. the FTSE 100 was down 7.4 points, or 0.1 percent at 5,470.9 after falling 0.2 percent on Thursday, but was on track for a 2 percent gain for the week. The index is now down about 15 percent this year. RBS posted a first-half loss of 691 million pounds -- one of the biggest losses in corporate history, but smaller than expected -- after...
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