This code creates a new legend and sets the number of columns to 2. Code Example 2:c++ TLegend* legend = new TLegend(0.75, 0.15, 0.95, 0.8); legend->SetNColumns(3); ``` This code creates a new legend and sets the number of columns to 3. Package/Library: This function is part of the ROOT package/library. ROOT is an open-source software framework developed by CERN for high-energy physics data analysis.