अन्तरिक्षमेवर्ग्वायुः साम तदेतदेतस्यामृच्यध्यूढं साम तस्मादृच्यध्यूढं साम गीयतेऽन्तरिक्षमेव सा वायुरमस्तत्साम ॥ १.६.२ ॥
In plain words
The middle region is the Ṛc and the wind is the Sāman. This Sāman rests upon that Ṛc; therefore the Sāman is sung as resting upon the Ṛc. The middle region is sā and the wind is ama, and that makes sāman.
The commentators
Chāndogyopaniṣadbhāṣyam· bhāṣya
अन्तरिक्षमेव ऋक् वायु साम इत्यादि पूर्ववत् ॥
In plain words
Intermediate space is the ṛk and wind is the sāman, exactly as explained before.
Close to the Sanskrit
The intermediate space indeed is the ṛk, wind is the sāman, and so forth, as before.