Intersection in interpolated plot

Hello everybody ;

I have equations for four curves :their equations are :

QH1=(f./tand(H1-0.26)) *(BLAck)* 
QH2=(BEA4./2)+(f./tand(H1-0.26)) *(BLUE)*

where H1 is a changing angle depending on time (hours)

Qbegining=(QTOUStt+w)-(w*cosd(Gammab)) *(RED many values)*
Qend=Qbegining+w*cosd(Gammab) *(green many values )*

so the values I have for these four equations are hour by hour (6 7 8 9 ...) for the plotting matlab did the interpolation for all the equations and drew the figure showed.

My Question : is there any possibility to know all the intersections points knowing that these latter occur in the interpolated zones.