[R] How to plot data using ggplot

[drunkenphd]

Hi,
I have a list of cities and their coordinates, and also for each city I have
a variable varA which I want to represent in a map using ggplot.
For example :

CityA	  lat 22.93977	lon 46.70663	varA 545

CityB	  lat 23.93977	lon 46.70663	varA 122

VarA values begin from 0 to 3000.
I want the color scale to represent  this range appropriately.
Can you help
Regards



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