set term pdf fontscale 0.74 size 6in,4in
set output 'diagram.pdf'
reset
unset label
unset border
unset xtics
unset ytics
unset ztics

set size square
set xrange [-1.25:1.25]
set yrange [-1.25:1.25]
center=-0.4
radius=0.75
coord=0.85
length=0.5
set object 1 circle at center size radius
set arrow from coord,0.0 to coord+length,0.0 lw 1 
set arrow from coord,0. length 0.5 angle -120
set label 'x' at coord+length,-0.05
set label 'y' at coord+0.03,length
set label 'z' at coord-0.25,-length 
set arrow from coord,0. to coord,0.5 lw 1
set arrow from center+radius*cos(pi/3),radius*sin(pi/3) length 0.4 angle -30 
set arrow from center+radius*cos(pi/2),radius*sin(pi/2) length 0.4 angle 0 
set arrow from center+radius*cos(0),radius*sin(0) length 0.4 angle -90 
set object 2 circle at center-0.2,-0.05 size 0.05
set object 4 circle at center-0.2,-0.05 size 0.02 front fillstyle solid fillcolor rgb "black"   
#set label 'X' at center-0.2-0.035,-0.05 font '1'
set label 'B' at center -0.2,-0.2 font '1'
set arrow from center,0. to center,radius nohead dt 2
set arrow from center,0. length radius angle 60  lt 1
set label '{/Symbol w}t' at center+0.012, 0.25 font '1'
set object 3 circle at center,0. size radius/2 arc [60:90] nowedge  
plot '-' u 1:2 ps 0 not
-0.25 0  
e
print 'diagram.pdf'
set term x11