[SOLVED] Simple graph presentation Forgive my not using the thread template but it doesn't really fit my problem. I got some ecology coursework back where I had to use a few graphs to present my data. In some of the graphs I had to present scatter plots with results from a pollution index (a score based on presence/absence of various species with different pollution tolerances) at several sites against total number of species observed there. I was marked down for plotting points rather than a line. If this was say pollution index vs distance down stream fair enough, but I'm sure a line graph would be unsuitable for my data. Was my marker having a bad day, or am I being really stupid?