Stocks listed in Europe were higher on Monday, as investors monitored the impact of a potential U.S. government shutdown later in the week.The pan-European Stoxx 600 was up about 0.3% by 9:25 a.m. in London (4:25 a.m. Eastern time), with most sectors in positive territory.The FTSE 100 had gained 0.4%, with the DAX and the CAC 40 both up about 0.1%.On the corporate front, Lufthansa said its free cash flow would generate over 2.5 billion euros ($2.93 billion) a year as it set earnings targets of 8%-10% over t ...