<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><div><font face="times new roman, new york, times, serif">Dear Mr. Herbert,</font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">I found a bug in PSTricks. </font></div><div><br></div><div>Even though the points (O) and (3,3) represent the same point,</div><div>the second pspicture produces an arc at a wrong pivot. </div><div><br></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">\documentclass[pstricks,border=1cm]</font><span style="font-family: 'times new roman', 'new york', times, serif; ">{standalone}</span></div><div><span style="font-family: 'times new
roman', 'new york', times, serif; ">\usepackage{pst-eucl}</span><br></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><span style="font-family: 'times new roman', 'new york', times, serif; ">\begin{document}</span><br></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">\begin{pspicture}[showgrid=top](9,8)</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\pstGeonode(3,3){O}(5,5){A}(5,1){B}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\pscircle[linestyle=dashed](O){2}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[origin={O},linecolor=red]{->}</font></div><div><font
face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>(O)%<=============== COMPARE THIS ONE</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>{2}{(A)}{(B)}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\psline(A)(O)(B)</font></div><div><font face="times new roman, new york, times, serif">\end{pspicture} </font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">\begin{pspicture}[showgrid=top](9,8)</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\pstGeonode(3,3){O}(5,5){A}(5,1){B}</font></div><div><font face="times new roman, new york, times, serif"><span
class="Apple-tab-span" style="white-space:pre"> </span>\pscircle[linestyle=dashed](O){2}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[origin={O},linecolor=red]{->}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>(3,3)%<================ WITH THIS ONE</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>{2}{(A)}{(B)}</font></div><div><font face="times new roman, new york, times, serif"><span class="Apple-tab-span" style="white-space:pre"> </span>\psline(A)(O)(B)</font></div><div><font face="times new roman, new york, times, serif">\end{pspicture} </font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times,
serif">\end{document}</font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">Thank you in advance.</font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">best regards,</font></div><div><font face="times new roman, new york, times, serif"><br></font></div><div><font face="times new roman, new york, times, serif">Higgs Boson</font></div></div></div></body></html>