Strike, dip direction and dip of joints

# Symbols made for GMT by Jose A. Alvarez-Gomez
#
# Geological symbol: Joint
#
# The symbol reads the strike and dip in the 3rd and 4th columns in psxy
#
N: 2 as
if $1 [> 0:90 then 0.5 -0.5 0.3 $2 l+fHelvetica-Oblique+jBR -W-
if $1 [> 90:180 then 0.5 0.5 0.3 $2 l+fHelvetica-Oblique+jTR -W-
if $1 [> 180:270 then -0.5 0.5 0.3 $2 l+fHelvetica-Oblique+jTL -W-
if $1 [> 270:360 then -0.5 -0.5 0.3 $2 l+fHelvetica-Oblique+jBL -W-
$1 R
-90 R
0 0 1 y
0.05 0 0.1 0.2 r