I would suggest calculating the maximum and minimum values and then plotting fill area plot.
1. Calculate the Max and Min in the source worksheet. Select and hight clicking all Y columns you want to calculate and select Statistics on Rows. On the Quantities tab, make sure “Minimum” and “Maximum” is checked under Quantities branch and uncheck all others. Click OK. 2 columns, Minimum and Maximum are added. Add them to the line plot graph.
2. Double click to open the Plot Details dialog. On the line tab, check “Fill Area Under Curve” and select “Fill to next data plot – One Color”.