dollar variables
{\pos(**$x**,**$y**)\t(**$start**,**$end**,\bord0)}
- lstart, lend, ldur, lmid
- margin_l, margin_r
- margin_v, margin_t, margin_b
- syln
- li
- lleft, lcenter, lright
- ltop, lmiddle, lbottom
- lx, ly
- lwidth, lheight
- sstart, send, smid
- sdur, skdur
- si
- sleft, scenter, sright
- sbottom, smiddle, stop
- sx, sy
- swidth, sheight
- start, end, mid
- dur, kdur
- i
- left, center, right
- top, middle, bottom
- x, y
- width, height