> dat1

   change values

1     -10   0.00

2      -9   0.50

3      -8   0.20

4      -7   0.30

5      -6   0.00

6      -5   0.00

7      -4   0.61

8      -3   0.40

9      -2   1.00

10     -1   0.80

p = ggplot() + xlim(-10, 10) + ylim(0,1) + labs(x= "change", y= "values")+

geom_point(data=dat1, aes(x=change, y=value, color=value), shape=19, size=3, alpha=0.5)+

scale_color_gradientn(colours=c("#FC4013","#FED246"))

p1 = p+geom_point(data=dat2, aes( x=change, y=value, color=value), shape=19, size=3, alpha=0.5)+

scale_color_gradientn(colours=c("#5CB0FD","#4DE775")) +

theme(axis.text.x = element_text(size=18,colour='grey8'),

         axis.text.y = element_text(size=18,colour='grey8'),

         axis.title.x = element_text(size=18,colour='grey8'),

         axis.title.y = element_text(size=20,colour='grey8'),

     strip.text.x = element_text(size=18,colour='grey8'),

         strip.background = element_rect(fill="transparent"),

    legend.position="none",

         legend.text=element_blank(),

         legend.title=element_blank(),

 legend.background = element_rect(fill="grey98", size=1, linetype="solid"),

         panel.background=element_rect("grey98"))

p1 + geom_vline(xintercept = 0,colour="grey68",linetype='twodash', size=2)+ geom_hline(yintercept = 0.5, colour="grey78")