search for: fef0d9

...1/(r^2) where r is the distance from the circle. I would also like to add a color bar with values going from -40 to -110 (and associate those with the color gradient that fills the circle). So far I experiemented with draw circle install.packages('plotrix')require(plotrix)colors<-c('#fef0d9','#fdcc8a','#fc8d59','#e34a33','#b30000')plot(c(-15,15),c(-15,15),type='n')draw.circle(0, 0, 10, nv = 1000, border = NULL, col = colors[1], lty = 1, lwd = 1)draw.circle(0, 0, 8, nv = 1000, border = NULL, col = colors[2], lty = 1, lwd = 1)draw.circle(0, 0,...