Question: Arrow color of TNB frame

 I would like to select the color of the arrow for T,N and B.

Thank you for any suggestions.

Ralph Wallace

restart;
with(VectorCalculus):with(plots):
Display the tangent, principal normal and binormal vectors on a curve.
c:=sqrt(a^2+b^2);
                                        (1/2)
                               / 2    2\    
                               \a  + b /    
a:=1:b:=1/2:
R4:=   PositionVector([a*cos(s/c),a*sin(s/c),b*s/c]);

 FramesOnHelix:=seq(PlotPositionVector(R4, s=0..2.5*Pi, tangent=true, normal=true, binormal=true, points=[A],curveoptions=[axes=framed,color=red,title = "Helix Frames, given by arclength parametrization", titlefont = [TIMES, ROMAN, 16], caption = "Figure 2.1(a)", captionfont = [TIMES, ROMAN, 14]]),A=0..5):
display(FramesOnHelix);