Fixed the null clines for the m=0 and c=0 cases to use the correct colour
Fixed the null clines for the m=0 and c=0 cases to use the correct colour

SUNY-SDE-2015/REU15,SUNY-SDE-2015/REU15,SUNY-SDE-2015/REU15,SUNY-SDE-2015/REU15