1st var: age [31,32,33,34,35]
2nd var: years of working [10,15]
3rd var: corresponding yearly income(*10k) [8,8,6,9,9,10,14,17,13,9]
-----edits---->Each combination of age&years corresponds to an income. For example, 31-yr-old person with 10 yrs of working experience earns 80k, 31-yr-old person with 15 yrs of working experience also earns 80k, etc.<----edits-----
I would like to represent the numbers in the third column with a color scale (smaller=blue --> larger=yellow) looking like a 2D histogram except the third dimension doesn't represent number of occurrence.