Removing artificial reflectors from given velocities ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Input: SALTREF... Minimum relative velocity increment at a reflector. $1... Gridded second velocity derivatives V11. $2... Gridded second velocity derivatives V22. $3... Gridded second velocity derivatives V33. $4... Gridded velocity. Output: $5... Gridded velocity, replaced by zero values at gridpoints probably situated at a reflector. V11=MIN($1,0) V22=MIN($2,0) V33=MIN($3,0) V11=V11*D1 V11=V11*D1 V22=V22*D2 V22=V22*D2 V33=V33*D3 V33=V33*D3 DER=V11+V22 DER=DER+V33 DER=DER/$4 DIF=DER+SALTREF DIF=MAX(-0.1,DIF) DIF=MIN(DIF,0.1) DIF=DIF+1 DIF=INT(DIF) $5=DIF*$4