I made a graph of Kaplan Meier curves for a pesticide bioassay of 4 concentrations (negative control, 1/10000 field rate, 1/100 field rate and field rate), which was recorded in the data frame as 0, 0.0001, 0.01 and 1. I expected the legend and curves in the order from the low concentration to high concentration:

I made a graph of Kaplan Meier curves for a pesticide bioassay of 4 concentrations (negative control, 1/10000 field rate, 1/100 field rate and field rate), which was recorded in the data frame as 0, 0.0001, 0.01 and 1. I expected the legend and curves in the order from the low concentration to high concentration: