Where to specify small icons (for notifications in status bar) in config.xml?

I solved it Image may be NSFW.
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            var androidConfig = {
               'senderID'   : _senderid,
               'badge'      : true,
               'sound'      : false,
               'alert'      : true,
               'icon'       : 'icon'
             };

added "icon" in the android registration options.