How to put numbers of column one of the file on the circles:
plot 'alias_SCN' using 2:3 with circles
This is some of alias_SCN entreis
1 50 91.66
2 45 83.66
3 55 83.66
4 40 75
5 50 75
6 60 75
7 35 83.66
8 65 83.66
9 25 83.66
10 30 75
Now what I am looking for is to put the numbers of column one on related circle.
Use the test command to find out which points are supported for each terminal (see e.g. Gnuplot line types). For the wxt terminal you can use pointtype 6.
To put a label above the point, use the labels plotting style
plot 'alias_SCN' using 2:3:(sprintf('%d', $1)) with labels offset 0,1 point pointtype 6 pointsize 2
If you want more control over the circles, you can also use the circles plotting style, in which case you must use two plot commands to get also the labels:
plot 'alias_SCN' using 2:3:(0.2) with circles,\
'' using 2:3:(sprintf('%d', $1)) with labels offset 0,1
The third column for the circles gives the radius, here a fixed radius of 0.2.
