Verse 8.6.1.6

atha dakṣiṇataḥ | virāḍasi dakṣiṇā digiti virāḍḍha nāmaiṣā dakṣiṇā digrudrāste devā adhipataya iti rudrā haitasya diśo devā adhipataya indro hetīnām pratidhartetīndro haivātra hetīnām pratidhartā pañcadaśastvā stomaḥ pṛthivyāṃ śrayatviti pañcadaśena haiṣā stomena pṛthivyāṃ śritā praugamukthamavyathāyai stabhnātviti praugeṇa haiṣokthenāvyathāyai pṛthivyāṃ stabdhā bṛhatsāma pratiṣṭhityā antarikṣa iti bṛhatā haiṣā sāmnā pratiṣṭhitāntarikṣa ṛṣayastvā prathamajā deveṣviti tasyokto bandhuḥ

Preview of English translation:

6. Then on the right (south) side (he lays down one), with (Vajasaneyi Samhita XV, 11), “Wide-ruling thou art, the southern region,” for wide-ruling indeed is that southern region;—“The divine Rudras are thine overlords,” for the divine Rudras are indeed the overlords of that region;—“Indra is the repeller of shafts,” for Indra, indeed, is here the repeller of shafts;—“The Pancadasha-stoma may uphold thee on earth!” for by the fifteenfold hymn it is indeed upheld on earth;—“The Praüga-shastra may support thee for steadiness’ sake!” for by the Praüga-shastra it is indeed supported on earth for steadiness’ sake;—“the Brihat-saman for stability in the air!” for by the Brihat-saman it is indeed established in the air;—“May the Rishis, the first-born, magnify thee among gods . . .!” the import of this (and the rest) has been explained.

For a detailled translation, including proper diacritics and footnotes, go the full English translation.