I have noticed several films with RMS ratings of 10, 8 and 7. I understand it is a measurment of grain on the film. But what I'm not sure about is which direction is better on this scale? Does a 10 represent LEAST possible grain? Or does 1 represent LEAST possible grain? The slide films I was looking at to find RMS values were Fuji Sensia (RMS 10), Fuji Astia (RMS 7) and Fuji Provia (RMS 8).