set output 'temperature_a.ps' 
set term postscript color enhanced 'Helvetica,18'  
set grid 
set nokey 
set xlabel 'Month from start of study ' 
set ylabel 'Temperature (F) ' 
set title 'Temperature in Central Park ' 
plot [][] 'temperature.dat' using ($1):($2)    pt 3 ps 1.5 lc 1 lw 3 t ''  
set output 
quit 
