Chinese markets are reopening today after the holiday Monday.The People's Bank of China (PBOC), China's central bank, is responsible for setting the daily midpoint of the yuan (also known as renminbi or RMB). The PBOC follows a managed floating exchange rate system that allows the value of the yuan to fluctuate within a certain range, called a "band," around a central reference rate, or "midpoint." It's currently at +/- 2%.Previous close was 7.1680PBOC injected 495.8bn yuan via 7-day reverse repos at 1.40%170.7bn yuan mature todaynet 325.1bn injection yuan This article was written by Eamonn Sheridan at investinglive.com.