The celebrated mantra of the Urdhva srotas, the vyomvyApin comprises of 368 syllables. Below is the version I am familiar with. Examination of 3 manuscripts vy1 from Chidambaram, vy2 from Madurai and vy3 from Tiruvatuturai reveals certain variations from version I have. I have thus far not been able to lay my hands on the surviving Kashmirian manuscripts of the same. The deletion in the same place in the vy1 and vy2 manuscripts appear to result from a break in the original leaf from which both were likely to have been copied. Some of these variants might probably be used validly. An oral version of a shaiva priest I observed had certain further peculiarities, which could all be attributed to errors due to the linguistic distortions produced by the influence of drAviDa bhASha.
OM vyoma-vyApine vyoma-rUpAya sarva-vyApine shivAya anantAya anAthAya anAshR^itAya dhruvAya [1] shAshvatAya yogapITha-saMsthitAya nitya-yogine dhyAna-hArAya OM namaH shivAya sarva-prabhave shivAya IshAna-mUrdhAya tat-puruSha-vaktrAya aghora-hR^idayAya vAmadeva-guhyAya sadyojAta-mUrtaye [2] OM namo namaH guhyAtiguhyAya goptre anidhanAya sarva-yogAdhikR^itAya sarva-vidyAdhipAya jyotirUpAya parameshvara-parAya [3] achetanAchetana vyomin vyomin vyApin vyApin arUpin arUpin prathama prathama tejas-tejaH jyotirjyotiH arUpa anagniH adhUma abhasma anAde na na na na dhU dhU dhU dhU OM bhUH OM bhuvaH OM suvaH shiva sharva [4] anidhana nidhana nidhanodbhava [5] paramAtman [6] maheshvara mahAdeva sadbhAveshvara [7] mahAtejaH yogAdhipate mu~ncha mu~ncha prathama prathama sharva sharva bhava bhava bhavodbhava sarva-bhUta-sukha-prada sarva-sAnnidhyakara [8] brahmA-viShNu-rudra-bhuvana-trayArchita architArchita asaMskR^itAsaMskR^ita pUrva-stitha pUrva-stitha sAkShin sAkShin kuru kuru pata~Nga pata~Nga pi~Nga pi~Nga j~nAna j~nAna shabda shabda sUkShma sUkShma shiva sharva sarvada [9] OM namaH shivAya
[1] vy2= shivAya anantAya anAthAya anAshR^itAya dhruvAya missing
vy1= anAthAya anAshR^itAya dhruvAya missing
vy3= anantAya<->AnandAya
[3] vy3= just parameshvarAya
[2] vy2= additional namaH
[4] vy3= shiva sharva missing
[5] vy3= has shiva sharva here instead
[6] vy2= paramAtmaka
[7] vy3= sarveshvara
[8] vy3= brahmA-viShNu-rudra-parArchita astutAstuta
vy1= brahmA-viShNu-rudra-para anarchitAnarchita
[9] vy2=OM namo namaH OM namo namaH
vy1=OM namo namaH OM shivAya namo namaH
vy3=OM namaH shivAya OM namo namaH
mAnasa-taraMgiNI 