The TRACE section in a TrendSpec definition has to have two TRACE Mandatory Values. A SOURCE subsection has to follow these mandatory values.
If required, you can specify one or more TRACE Optional Values after the above TRACE mandatory values. TRACE optional values can be placed before or after the SOURCE subsection. For more information, Optional Values.
For each TRACE section in a TrendSpec definition, there has to be a corresponding YAXIS section. If TrendSpec is used to define an ad hoc Trend that has multiple traces, the TrendSpec definition has to contain a separate TRACE section and a corresponding YAXIS section for each trace (see Multiple Trace Ad Hoc Trends).