专业服务板块10月13日涨0.73%，钢研纳克领涨，主力资金净流入786.06万元

Core Insights - The professional services sector increased by 0.73% on the previous trading day, with Steel Research Nack leading the gains [1] - The Shanghai Composite Index closed at 3889.5, down 0.19%, while the Shenzhen Component Index closed at 13231.47, down 0.93% [1] Fund Flow Analysis - The professional services sector saw a net inflow of 7.86 million yuan from institutional investors, while retail investors experienced a net outflow of 76.27 million yuan [2] - Notable individual stock performances include: - Zhonggang Tianyuan (002057) with a net inflow of 55.18 million yuan from institutional investors, but a net outflow of 61.75 million yuan from retail investors [2] - Huace Testing (300012) had a net inflow of 36.25 million yuan from institutional investors and a net outflow of 77.02 million yuan from retail investors [2] - Steel Research Nack (300797) recorded a net inflow of 19.68 million yuan from institutional investors, but a net outflow of 13.35 million yuan from retail investors [2] - Xigao Institute (688334) saw a net inflow of 12.35 million yuan from institutional investors, with a net outflow of 15.76 million yuan from retail investors [2] - Guodian Measurement (002967) had a net inflow of 2.57 million yuan from institutional investors, but a significant net outflow of 19.03 million yuan from retail investors [2]