...
An IDMA display shows the difference between accumulated values of an observed time series and average accumulation of a number of time series from a base group of locations. If the observed time series has missing values, values from an estimated time series can be used.
...
Example 4 shows an IDMA display. The blue, green, and red lines each correspond to accumulation differences for three different time series from three different locations, namely: ALCOVE DAM, ALBANT INTL AP, and ALBANY NVVFO UNIV DORSET 2 SET, PERU, and DALTON. The blue line is thicker than the rest because it corresponds to the location (ALCOVE DAMDORSET 2 SET) which is selected in the location drop down. The white dots gray lines show calculations with estimated values, wherever observation values were not available.
...
Example 4: an IDMA display
Applying modifiers
...