Declension table of ?ṛgmat

Masculine	Singular	Dual	Plural
Nominative	ṛgmān	ṛgmantau	ṛgmantaḥ
Vocative	ṛgman	ṛgmantau	ṛgmantaḥ
Accusative	ṛgmantam	ṛgmantau	ṛgmataḥ
Instrumental	ṛgmatā	ṛgmadbhyām	ṛgmadbhiḥ
Dative	ṛgmate	ṛgmadbhyām	ṛgmadbhyaḥ
Ablative	ṛgmataḥ	ṛgmadbhyām	ṛgmadbhyaḥ
Genitive	ṛgmataḥ	ṛgmatoḥ	ṛgmatām
Locative	ṛgmati	ṛgmatoḥ	ṛgmatsu

Compound ṛgmat -

Adverb -ṛgmantam