<map id="structs" name="structs"> <area shape="rect" id="node2" href="$group__base__blk.html" title="All C++ blocks are derived from these base classes." alt="" coords="769,8,956,37"/> <area shape="rect" id="node3" href="$group__block.html" title="All C++ blocks that can be used in GR graphs are listed here or in the subcategories..." alt="" coords="7,8,279,37"/> </map>