Fixed version:

#declare RCon = 2.3;
#declare XPos = 0.0;
#declare ZPos = RCon-XPos;
#while (XPos <= RCon)
  sphere {< XPos,0, ZPos>,.1}
  sphere {< XPos,0,-ZPos>,.1}
  sphere {<-XPos,0,-ZPos>,.1}
  sphere {<-XPos,0, ZPos>,.1}
  #declare XPos = XPos+.1;
  #declare ZPos = RCon-XPos;
#end//while

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