Hi. Regions in SMath are evaluated from left to right and top to bottom. There are several coefficients of the summation that are defined after the insertion point of the region corresponding to the graph, so they are not available when it is performed. If you put the graph below then the numerical calculation can already be done. Finally, in SMath graphs you have to zoom manually with the mouse wheel, or control / shift mouse wheel.
Best regards.
Alvaro.