In Vedic Sanskrit, most of the words have one accented syllable, which is traditionally called udātta ("raised") and written with an acute mark ⟨◌́⟩ in the transcription.
Unaccented syllables are called anudātta ("not raised") and are not marked in the transcription.
The falling tone in the post-tonic syllable is called svarita ("sounded").
For example, in RV 1.10.8c, became Independent svarita is caused by sandhi of adjacent vowels.
There are four variants of it: Independent svarita occurs about 1300 times in the Rigveda, or in about 5% of padas.