SAS - Labeling Kernel Density Line Intersections in SGplot with multiple histograms - sas

Question

Disclaimer: I am an amateur programmer. I am a student.
So I've been working on a Van Westendorf price model which requires analysis of critical points produced when the kernel density lines overlayed on 4 histograms intersect. My current model has 3 histograms, so 3 lines, and 2 intersections. How can I label these intersections?
You can see the output here.
http://i.imgur.com/6TGWv4l.jpg
Here is the code:
Proc Import Out = work.SASdata datafile =
"C:\Users\jdelizza\Desktop\SimpleSAS.xls"
DBMS = xls;
Sheet = "Asthma";
Getnames = yes;
Label I_Price_A = 'Too Expensive'
I_Price_B = 'Inexpensive'
I_Price_C = 'Slightly Expensive'
F_Price_Low = 'Full Price Inexpensive'
F_Price_Expensive = 'Full price Expensive'
F_Price_Too_Expensive = 'Full Price Too Expensive'
P_Price_Low = 'Personalized Price Inexpensive'
P_Price_Expensive = 'Personalized price Expensive'
P_Price_Too_Expensive= 'Personalized Price Too Expensive';
run;
proc sgplot;
Title "Those with Asthma Indoor Pricing";
histogram I_Price_A / fillattrs=graphdata1 transparency = .5 binstart =1
binwidth=50;
density I_Price_A /type = kernel lineattrs=graphdata1;
histogram I_Price_B / fillattrs=graphdata2 transparency=.5 binstart=1
binwidth=50;
density I_Price_B /type = kernel lineattrs=graphdata2;
histogram I_Price_C / fillattrs=graphdata3 transparency=.5 binstart=1
binwidth=50;
density I_Price_C / type = kernel lineattrs=graphdata3;
keylegend / location=inside position=topright noborder across=2;
yaxis grid;
xaxis display=(nolabel) values=(0 to 1000 by 100);
run;