Diptagama 16.41

16.41

tattiryaggatamānaṃ yattatsarvaṃ tu pramāṇakam
tasyāvṛtaṃ tu yanmānaṃ tanmānonmānamucyate

The horizontal measure of it—all that is pramāṇa; / the circumscribing measure of it is called unmāna;