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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">1) How can I get rid of the green arrow at the center in the project below? (in fact there is a read arrow behind it)</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">2) How can I put a centered R above the red arrow without specifying coordinates - something like \naput[labelsep=0.1,npos=0.5,nrot=:U]{$R$}</font></div>

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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">Poul Riis</font></div>

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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\documentclass[12pt,a4paper]{article}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\usepackage[left=2cm,top=1.25cm,right=1.5cm,bottom=2.5cm]{geometry}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\usepackage[svgnames,x11names]{xcolor}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\usepackage{pst-rubans}</font></div>

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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\begin{document}</font></div>

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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\begin{center}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\begin{pspicture}(-5,-5)(5,5)</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\psset{viewpoint=0 50 50,Decran=50}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\psSpiralRing[r1=4,r0=1,fillcolor=blue,incolor=gray!50,grid,dPHI=0.5,spires=40,resolution=1440]%</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\axesIIID[showOrigin=false,axisnames={},arrows=<->,linecolor=Red1,linewidth=2pt](0,0,0)(4,0,0)</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">% Here I would like something like \naput[labelsep=0.1,npos=0.5,nrot=:U]{$R$}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\axesIIID[showOrigin=false,axisnames={},arrows=<->,linecolor=Green3,linewidth=2pt](4,0,0)(5,0,0)</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\end{pspicture}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\end{center}</font></div>

<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#0000DD" style="font-family:Arial;font-size:10pt;color:#0000DD;">\end{document}</font></div>

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