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The data_only parameter to many NATS and CARMA functions prevents NATS or CARMA from displaying a template. For example, the NATS4 template function [[nats_list_linkcodes usually displays linkcodes using a template and puts them in the {$linkcodes} array, but data_only lets you change that behavior. For example, the following code will set the {$linkcodes} array without displaying anything to the viewer:
- {nats_list_linkcodes data_only=1}