▁programs ▁do ▁not ▁totally ▁follow ▁the ▁specification . ▁ ▁For ▁example , ▁O DE C ▁uses ▁the ▁opposite ▁byte ▁order ▁and ▁adds ▁ 3 2 0 ▁bytes ▁to ▁the ▁tail ▁of ▁each ▁trace . ▁ ▁PA SS C AL ▁SE G - Y ▁format ▁A ▁related ▁format ▁called ▁" PASS C AL ▁SE G - Y " ▁is ▁sometimes ▁used ▁to ▁store ▁continuous ▁se ism ic ▁records ▁longer ▁than ▁a ▁typical ▁shot ▁gather ▁and ▁should ▁not ▁be ▁confused ▁with ▁the ▁shot - g ather ▁focused ▁" SE G - Y " ▁format ▁documented ▁above . ▁PA SS C AL ▁SE G - Y ▁files ▁contain ▁a ▁single ▁trace , ▁and ▁therefore ▁consist ▁of ▁sole ly ▁a ▁ 2 4 0 - byte ▁trace ▁header ▁and ▁a ▁variable - length ▁stream ▁of ▁binary ▁integers ▁( which ▁can ▁be ▁much ▁longer ▁than ▁the ▁ 3 2 7 6 7 - sample ▁limit ▁in ▁shot - g ather ▁SE G - Y ▁files ). ▁ ▁See ▁also ▁Ref lection ▁se ism ology ▁List ▁of ▁free ▁ge oph ys ics ▁software ▁ ▁References ▁▁ ▁Download able ▁SE G ▁Techn ical ▁Stand ards , ▁including ▁SE G ▁Y ▁revis ions ▁ 0 , ▁ 1 ▁and ▁ 2 ▁ ▁Category : Comput er ▁file ▁formats ▁Category : Ge oph ys ics ▁Category : Open ▁formats <0x0A> </s> ▁Ep ice ph ala ▁st au rop a ▁is ▁a ▁moth ▁of ▁the ▁family ▁G rac ill ari idae . ▁It ▁is ▁known ▁from ▁Meg hal aya , ▁India . ▁