All of Wednesday’s gains on the main index of the Greek bourse were wiped out yesterday in a session during which investors chose to cash in any one-day gains, adding to analysts’ worries about the course of the market. The Athens Exchange general index closed at 1,541.79 points yesterday, contracting 2.52 percent from Wednesday’s close at 1,581.69 points. On Tuesday, it had ended at 1,542.62 points. The blue chip FTSE/ATHEX 20 index shrank yesterday by 3.17 percent to end at 753.87 points. All but two blue chips registered losses yesterday, led by National Bank (down 6.41 percent), Alpha Bank (6.14 percent), Eurobank EFG (5.44 percent) and Hellenic Postbank (4.33 percent). Mytilineos gained 2.10 percent and Jumbo climbed 0.23 percent. A total of 54 stocks went up, 114 headed down and 47 remained unchanged. Construction group Edrasi led the gainers with a 16.67 percent rise, while Attica Publications posted the biggest losses (down 19.48 percent). Turnover came to 151.1 million euros.