%Coordinates of points spanning line
\pgfmathparse{1.0} \let\x\pgfmathresult;
\pgfmathparse{0.22} \let\y\pgfmathresult;
\pgfmathparse{1.5} \let\r\pgfmathresult;
\pgfmathparse{4} \let\k\pgfmathresult;
\pgfmathparse{5.25} \let\kmax\pgfmathresult;
\pgfmathparse{1.35} \let\h\pgfmathresult;
\pgfmathparse{1.56} \let\hght\pgfmathresult;


\coordinate (V) at (\x,\y);
\coordinate (W) at (\x,-\y);

\coordinate (A) at (0,0);
\coordinate (R) at ($(A)+\kmax*(V)$);
\coordinate (S) at ($(A)+\kmax*(W)$);


\coordinate (AA) at ($(A)-1.25*(V)$);
\coordinate (BB) at ($(A)-1.25*(W)$);

\draw [] (AA) -- (R);
\draw [] (BB) -- (S);

\node at ($(R)+(0.25,0.1)$) {\small{$r$}};
\node at ($(S)+(0.25,-0.1)$) {\small{$s$}};



\coordinate (A2) at ($(A)+1*(V)$);
\coordinate (A3) at ($(A)+2*(V)$);
\coordinate (Ak) at ($(A)+\k*(V)$);

\coordinate (B2) at ($(A)+1*(W)$);
\coordinate (B3) at ($(A)+2*(W)$);
\coordinate (Bk) at ($(A)+\k*(W)$);


\filldraw  (A) circle  (\r pt);
\filldraw  (A2) circle (\r pt);
\filldraw  (A3) circle (\r pt);
\filldraw  (Ak) circle (\r pt);
\filldraw  (B2) circle (\r pt);
\filldraw  (B3) circle (\r pt);
\filldraw  (Bk) circle (\r pt);


\draw [] (\x,\h) -- (\x,-\h);
\draw [] (2*\x,\h) -- (2*\x,-\h);
\draw [] (\k*\x,\h) -- (\k*\x,-\h);

\node at ($(A)+(0,0.3)$) {\small{$A_1$}};
\node at ($(A2)+(-0.25,0.2)$) {\small{$A_2$}};
\node at ($(A3)+(-0.25,0.2)$) {\small{$A_3$}};
\node at ($(Ak)+(-0.25,0.2)$) {\small{$A_k$}};

\node at ($(B2)+(-0.25,-0.2)$) {\small{$B_2$}};
\node at ($(B3)+(-0.25,-0.2)$) {\small{$B_3$}};
\node at ($(Bk)+(-0.25,-0.2)$) {\small{$B_k$}};

\node at (\x,\hght) {\small{$t_2$}};
\node at (2*\x,\hght) {\small{$t_3$}};
\node at (\k*\x,\hght) {\small{$t_k$}};

