Dear friends - below is a subset of a much larger material showing two
ways of generating two "lines". The intention is to have the colour
reflect a variable, pH, but the legend is disturbed. The little part
marked "3" above the colour scale is unwelcome. Why did it appear? How
could I avoid it?
I'm on Windows 7, R version 3.4.1 (2017-06-30) -- "Single Candle"