set term png enhanced font "Times"
set nokey
set pm3d map
#set pm3d interpolate 5,5
set size 1,1
#set cbrange [0:65535]
#等高線図、コンターを書く場合に使用
set palette rgbformulae 22,13,-31
#set palette defined(0"blue",32768"white",65535"red")
#set palette defined(0"black",65535"white")

#set format x ""
#set format y ""
#set notics
#unset colorbox

#set datafile separator ","

set border lw 2.5
set mxtics 5
set mytics 5
set tics scale 2
set tics out

set output "Gray_100.png"
sp "Gray_100.txt" u 1:(-$2):3