An @ (at‑sign) in Column 1 indicates to the Model processor that the line contains one or more Model Control Statements. The @ is the default Control Statement delimiter. You can change this delimiter for any particular model by using the $DELIM keyword.
You can place multiple Model Control statements on a single line if they are separated by a ; (semi‑colon). To make the statements easier for you to read, you can put spaces on either side of the semi-colon.
The value of a Model Control statement must be surrounded by single quotes. If the value itself must contain a quote, use two single quotes to distinguish the embedded quote from the value delimiters.
This subject covers each of the Model Control Statements.
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