Yoga Sutra 1.44 sa-vicara identification refers to subtle elements,

Sūtra I.44 In the same way, when it is on subtle objects, it is called sa-vicāra (with subtle associations) and nir-vicāra (without subtle associations) Of these two, the sa-vicāra identification refers to subtle elements, whose qualities are manifest, with a particular location, time, cause and experience as their features. The object of the meditation is the subtle elements, and then it is called sa-vicāra and nir-vicāra. The subtle elements (tan-mātra) are those of sound, etc. In the Sanskrit compound deśakālanimittānubhavāvacchinneṣu, the word for ‘particularized’ applies to each element separately, so the meaning is: featured by a particular location, a particular time, a particular cause, and a particular experience. For purposes of ordinary life, everything is taken as having a particular location and so on, as related to the knower of that object, its subject. Such being the case, sa-vicāra is when the mental-constructs (vikalpa) of location and the others are …

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