latex table weird spacing code example

Example 1: latex reduce letter spacing

\usepackage[tracking=true]{microtype}

\textls[100]{normal} % 100 is the default value
\textls[200]{more space}
\textls[50]{less space}

Example 2: vertical space in table cell latex rule

\newcommand\T{\rule{0pt}{2.6ex}}       % Top strut
\newcommand\B{\rule[-1.2ex]{0pt}{0pt}} % Bottom strut