2D color graph (z size as a color)

Is there any possibility to draw a 2D color graph by using z as a
color scale.
With the code which I pasted below, it is possible. But my problem is
that; it connects between 2 point because of pm3d features. Is it
possible to disable it and make every value separately just a point?
Thanks to who reply :-)
Sezgin

set border 4095 front linetype -1 linewidth 1.000
set view map
set samples 50, 50
set isosamples 50, 50
unset surface
set style data pm3d
set style function pm3d
set ticslevel 0
set title "colour map,"
set xlabel "x"
set xrange [ 0.0000 : 50.0000 ] noreverse nowriteback
set ylabel "y"
set yrange [ 0.0000 : 50.0000 ] noreverse nowriteback
set zrange [ 0.0000 : 100.00000 ] noreverse nowriteback
set pm3d implicit at b
splot "asciidata.dat"

Data
# X   Y    Z
1	49	2
2	48	4
3	47	1
4	46	8
5	45	10
6	44	12
7	43	14
8	42	20
9	41	18
10	40	20
11	39	22
12	38	24
13	37	70
14	36	28
47	3	1
46	4	8
45	5	10
44	6	12
43	7	14
42	8	20

41	9	18
40  1	2      0
39  1	2       2
38  1 	24
37  1	        70