By default, the IdemmM property specifies the name of another value-axis to synchronize min, max, and major-unit values from when scrolling. If omitted or the value-axis with the given name is not found, these values are synchronized with the default value-axis. For instance, using this feature, you can synchronize two value axes, one on the left and one on the right, so that they update as soon as the user scrolls the chart. The Name property defines the name of the value axis