图中的颜色点因值向量的不同而不同

I'm plotting the plot below using R's plot function. It is a plot of a vector 'shiftTime' of shift in time. I have another vector 'intensity' of the intensity values ranging from ~3 to ~9. I want to color my points in the plot based on those values with a color gradient. The examples I can find color on the value of the actual plotted points, so in this case the values of the vector 'shiftTime'. Is it also possible to use a different vector, as long as the corresponding values are on the same index?I'm plotting the plot below using R's plot func