The meter value definition specifies the dial values and position of the needle. To show multiple meters, use either multiple meter value definitions or grouping. For example, Figure 16‑36 is a standard meter chart. Standard meter charts use only one needle for each meter. The chart uses population as the needle value and city as a grouping field. Because the chart builder requires a value in the category field, provide a string containing a single space, " ", for the Category Definition.

The chart in Figure 16‑36 uses the data in Table 16‑8.

The chart builder uses the expressions to position the needles and plot each population value as the position of a needle on the dial. The chart builder uses the values to position the dials, one for each meter, in the chart. The grouping sets up a meter for each city. The legend identifies the meters.