The following chart shows the impact on the FTSE 100 Index of a 10% move in the share price of each of the 20 largest companies in the index. [The reference level for the FTSE 100 is 6318.]

For example, if the share price of Shell fell (rose) 10% the impact on the FTSE 100 Index would be a fall (rise) of 49 points in the index.