'As per the requirement of the user, Excel gives an option to change chart elements.' State the options available to change the 'shape outline'.

Changing the shape outline: § To apply a different shape outline, click Shape Outline and then do one of the following. § To use a different outline colour, under Theme colours or Standard colours, click the colour to use. § To remove the outline colour from the selected chart element click No Outline. If the selected element is a line, the line will no longer be visible on the chart. § To use an outline colour that is not available under Theme or Standard colour click More Outline Colours in the colours dialogue box then specify the colour on the standard or custom tab and then click OK. § To change the weight (thickness) of a line or border click weight option and then select the line that we wish to use. For additional line or border style click on More lines. § To use broken line or border, use Dashes and then click dash type to use. § To use arrows to lines, click Arrows and then click the arrow style for border can not be used. To apply a different shape effect click 'Shape Effect'. The shape effects depend on chart element that we select as these are not available to all chart elements.