symbol

meaning

$\left({\widehat{x}}_{0,\text{center}},{\widehat{y}}_{0,\text{center}}\right)$

estimation of the geometrical center for first tick-mark

$l_{0,\text{tick-mark}}$

estimation of the tick-mark length for first tick-mark

$\left(x_{\text{current},\text{center}},y_{\text{current},\text{center}}\right)$

estimation of the geometrical center for non first tick-mark

$l_{\text{current},\text{tick-mark}}$

estimation of the tick-mark length for non first tick-mark