Stock market highlights: Equity markets were choppy on Monday as global mood remained sombre, and investors booked profit after Friday’s 2-per cent rally. The S&P BSE Sensex gyrated within a band of 771 points, before settling at 56,789, down 638 points or 1.11 per cent. The NSE Nifty50, too, closed 207 points, or 1.21 per cent, lower at 16,887. The index hit a high of 17,114.65, and a low of 16,855.55 during the…