TI-83 Plus Draw Instructions 227
patres specifies one of eight shading resolutions.
patres
=
1shades every pixel (default)
patres
=
2shades every second pixel
patres=3shades every third pixel
patres=4shades every fourth pixel
patres=5shades every fifth pixel
patres=6shades every sixth pixel
patres=7shades every seventh pixel
patres=8shades every eighth pixel
Shade(lowerfunc,upperfunc[,Xleft,Xright,pattern,patres])