   \begin{longtable}{Xl>{\ttfamily\textbackslash}Xl}
     \caption{predefined units}\\
     \toprule
     \emph{name} &\emph{sign} &\multicolumn{1}{X}{\emph{macro}}&\emph{alias}\\
     \midrule \endfirsthead
     \caption{predefined units}\\
     \toprule
     \emph{name}      &\emph{sign} &\multicolumn{1}{X}{\emph{macro}}&\emph{alias}\\
     \midrule \endhead \bottomrule \endfoot
     \multicolumn{4}{l}{\emph{base units}}\\[.5ex]
     meter            &\unitsignonly{\meter}            &meter &                \\
     kilogram         &\unitsignonly{\kilogram}         &kilogram   &\cmd{\kg}       \\
     mole             &\unitsignonly{\mole}             &mole  & \\
     second           &\unitsignonly{\second}           &second&\cmd{\sek}\\
     ampere           &\unitsignonly{\ampere}           &ampere&\\
     kelvin           &\unitsignonly{\kelvin}           &kelvin&\\
     candela          &\unitsignonly{\candela}          &candela&\\[1ex]
     \multicolumn{4}{l}{\emph{units of length}}\\[.5ex]
     picometer        &\unitsignonly{\picometer}        &picometer&\cmd{\picom}\\
     nanometer        &\unitsignonly{\nanometer}        &nanometer&\cmd{\nm}\\
     micrometer       &\unitsignonly{\micrometer}       &micrometer&\cmd{\micm}\\
     millimeter       &\unitsignonly{\millimeter}       &millimeter&\cmd{\mm}\\
     centimeter       &\unitsignonly{\centimeter}       &centimeter&\cmd{\cm}\\
     decimeter        &\unitsignonly{\decimeter}        &decimeter&\cmd{\dm}\\
     kilometer        &\unitsignonly{\kilometer}        &kilometer&\cmd{\km}\\[1ex]
     \multicolumn{4}{l}{\emph{units of weight}}\\[.5ex]
     gram             &\unitsignonly{\gram}             &gram  &                \\
     femtogram        &\unitsignonly{\femtogram}        &femtogram&\cmd{\fg}\\
     picogram         &\unitsignonly{\picogram}         &picoram&\cmd{\pg}\\
     nanogram         &\unitsignonly{\nanogram}         &nanogram&\cmd{\nanog}\\
     microgram        &\unitsignonly{\microgram}        &microgram&\cmd{\micg}\\
     milligram        &\unitsignonly{\milligram}        &milligram&\cmd{\mg}\\[1ex]
     \multicolumn{4}{l}{\emph{units of amount of substance}}\\[.5ex]
     femtomole        &\unitsignonly{\femtomole}        &femtomole&\cmd{\fmol}\\
     picomole         &\unitsignonly{\picomole}         &picomole&\cmd{\pmol}\\
     nanomole         &\unitsignonly{\nanomole}         &nanomole&\cmd{\nmol}\\
     micromole        &\unitsignonly{\micromole}        &micromole&\cmd{\micmol}\\
     millimole        &\unitsignonly{\millimole}        &millimole&\cmd{\mmol}\\[1ex]
     \multicolumn{4}{l}{\emph{units of time}}\\[.5ex]
     attosecond       &\unitsignonly{\attosecond}       &attosecond&\\
     femtosecond      &\unitsignonly{\femtosecond}      &femtosecond&\cmd{\fs}\\
     pikosecond       &\unitsignonly{\picosecond}       &picosecond&\cmd{\ps}\\
     nanosecond       &\unitsignonly{\nanosecond}       &nanosecond&\cmd{\ns}\\
     microsecond      &\unitsignonly{\microsecond}      &microsecond&\cmd{\mics}\\
     millisecond      &\unitsignonly{\millisecond}      &millisecond&\cmd{\ms}\\[1ex]
     \multicolumn{4}{l}{\emph{units of amperage}}\\[.5ex]
     picoampere       &\unitsignonly{\picoampere}       &picoampere&\cmd{\pA}\\
     nanoampere       &\unitsignonly{\nanoampere}       &nanoampere&\cmd{\nA}\\
     microampere      &\unitsignonly{\microampere}      &microampere&\cmd{\micA}\\
     milliampere      &\unitsignonly{\milliampere}      &milliampere&\cmd{\mA}\\
     kiloampere       &\unitsignonly{\kiloampere}       &kiloampere&\cmd{\kA}\\[1ex]
     \multicolumn{4}{l}{\emph{units of volume}}\\[.5ex]
     liter            &\unitsignonly{\liter}            &liter&\\
     femtoliter       &\unitsignonly{\femtoliter}       &femtoliter&\cmd{\fl}\\
     picoliter        &\unitsignonly{\picoliter}        &picoliter&\cmd{\pl}\\
     nanoliter        &\unitsignonly{\nanoliter}        &nanoliter&\cmd{\nl}\\
     microliter       &\unitsignonly{\microliter}       &microliter&\cmd{\micl}\\
     milliliter       &\unitsignonly{\milliliter}       &milliliter&\cmd{\ml}\\
     centiliter       &\unitsignonly{\centiliter}       &centiliter&\cmd{\cl}\\
     deciliter        &\unitsignonly{\deciliter}        &deciliter&\cmd{\dl}\\
     hectoliter       &\unitsignonly{\hectoliter}       &hectoliter&\cmd{\hl}\\
     cubicmeter       &\unitsignonly{\cubicmeter}       &cubicmeter&\\
     cubicmicrometer  &\unitsignonly{\cubicmicrometer}  &cubicmicrometer&\\
     cubicmillimeter  &\unitsignonly{\cubicmillimeter}  &cubicmillimeter&\\[1ex]
     \multicolumn{4}{l}{\emph{units of area}}\\[.5ex]
     squaremeter      &\unitsignonly{\squaremeter}      &squaremeter&\\
     ar               &\unitsignonly{\ar}               &ar&\\
     Hektar           &\unitsignonly{\hektar}           &hektar&\\
     squarecentimeter &\unitsignonly{\squarecentimeter} &squarecentimeter&\\
     squaremillimeter &\unitsignonly{\squaremillimeter} &squaremillimeter&\\
     squarekilometer  &\unitsignonly{\squarekilometer}  &squarekilometer&\\[1ex]
     \multicolumn{4}{l}{\emph{more units of weight}}\\[.5ex]
     ton              &\unitsignonly{\ton}              &ton&\\[1ex]
     \multicolumn{4}{l}{\emph{derived units of electricity}}\\[.5ex]
     volt             &\unitsignonly{\volt}             &volt&\\
     millivolt        &\unitsignonly{\millivolt}        &millivolt&\cmd{\mV}\\
     kilovolt         &\unitsignonly{\kilovolt}         &kilovolt&\cmd{\kv}\\
     Watt             &\unitsignonly{\watt}             &watt&\\
     milliwatt        &\unitsignonly{\milliwatt}        &milliwatt&\\
     kilowatt         &\unitsignonly{\kilowatt}         &kilowatt&\\
     megawatt         &\unitsignonly{\megawatt}         &megawatt&\\
     coulomb          &\unitsignonly{\coulomb}          &coulomb&\\
     ohm              &\unitsignonly{\ohm}&ohm \textrm{or} \cmd{\Ohm}&\\
     kiloohm          &\unitsignonly{\kiloohm}          &kiloohm&\\
     megaohm          &\unitsignonly{\megaohm}          &megaohm&\\
     gigaohm          &\unitsignonly{\gigaohm}          &gigaohm&\\
     siemens          &\unitsignonly{\siemens}          &siemens&\\
     millisiemens     &\unitsignonly{\millisiemens}     &millisiemens&\\
     farad            &\unitsignonly{\farad}            &farad&\\
     femtofarad       &\unitsignonly{\femtofarad}       &femtofarad&\\
     picofarad        &\unitsignonly{\picofarad}        &picofarad&\\
     nanofarad        &\unitsignonly{\nanofarad}        &nanofarad&\\
     microfarad       &\unitsignonly{\microfarad}       &microfarad&\\
     millifarad       &\unitsignonly{\millifarad}       &millifarad&\\[1ex]
     \multicolumn{4}{l}{\emph{units of energy}}\\[.5ex]
     joule            &\unitsignonly{\joule}            &joule&\\
     millijoule       &\unitsignonly{\millijoule}       &millijoule&\\
     kilojoule        &\unitsignonly{\kilojoule}        &kilojoule&\cmd{\kJ}\\
     megajoule        &\unitsignonly{\megajoule}        &megajoule&\\
     calorie          &\unitsignonly{\calory}           &calory&\\
     kilocalorie      &\unitsignonly{\kilocalory}       &kilocalory&\\
     electronvolt     &\unitsignonly{\electronvolt}     &electronvolt&\cmd{\eV}\\
     millielectronvolt&\unitsignonly{\millielectronvolt}&millielectronvolt&\cmd{\meV}\\
     kiloelectronvolt &\unitsignonly{\kiloelectronvolt} &kiloelectronvolt&\cmd{\keV}\\
     megaelectronvolt &\unitsignonly{\megaelectronvolt} &megaelectronvolt&\cmd{\MeV}\\
     gigaelectronvolt &\unitsignonly{\gigaelectronvolt} &gigaelectronvolt&\cmd{\GeV}\\
     teraelectronvolt &\unitsignonly{\teraelectronvolt} &teraelectronvolt&\cmd{\TeV}\\
     \multicolumn{4}{l}{\emph{more units of time}}\\[.5ex]
     minute           &\unitsignonly{\minute}           &minute&\\
     hour             &\unitsignonly{\hour}             &hour&\\
     days             &\unitsignonly{\days}             &days&\\[1ex]
     \multicolumn{4}{l}{\emph{units of temperature}}\\[.5ex]
     degree Celsius   &\unitsignonly{\celsius}          &celsius \textrm{or} \cmd{\Celsius}&\\[1ex]
     \multicolumn{4}{l}{\emph{units of angle}}\\[.5ex]
     radian           &\unitsignonly{\radian}           &radian&\\
     steradian        &\unitsignonly{\steradian}        &steradian&\\
     degree           &\unitsignonly{\degree}           &degree \textrm{or} \cmd{\Degree}&\\
     arc minute       &\unitsignonly{\arcmin}           &arcmin&\\
     arc second       &\unitsignonly{\arcsec}           &arcsec&\\[1ex]
     \multicolumn{4}{l}{\emph{units of frequencies}}\\[.5ex]
     hertz            &\unitsignonly{\hertz}            &hertz&\\
     kilohertz        &\unitsignonly{\kilohertz}        &kilohertz&\cmd{\kHz}\\
     megahertz        &\unitsignonly{\megahertz}        &megahertz&\cmd{\MHz}\\
     gigahertz        &\unitsignonly{\gigahertz}        &gigahertz&\cmd{\GHz}\\[1ex]
     \multicolumn{4}{l}{\emph{units of force}}\\[.5ex]
     newton           &\unitsignonly{\newton}           &newton&\\
     millinewton      &\unitsignonly{\millinewton}      &millinewton&\\
     kilonewton       &\unitsignonly{\kilonewton}       &kilonewton&\\[1ex]
     \multicolumn{4}{l}{\emph{units of pressure}}\\[.5ex]
     pascal           &\unitsignonly{\pascal}           &pascal&\\
     hectopascal      &\unitsignonly{\hectopascal}      &hectopascal&\\
     bar              &\unitsignonly{\uBar}             &uBar&\\
     millibar         &\unitsignonly{\millibar}         &millibar&\\[1ex]
     \multicolumn{4}{l}{\emph{units of magnetism}}\\[.5ex]
     weber            &\unitsignonly{\weber}            &weber&\\
     tesla            &\unitsignonly{\tesla}            &tesla&\\
     henry            &\unitsignonly{\henry}            &henry&\\[1ex]
     \multicolumn{4}{l}{\emph{units of light}}\\[.5ex]
     lumen            &\unitsignonly{\lumen}            &lumen&\\
     lux              &\unitsignonly{\lux}              &lux&\\[1ex]
     \multicolumn{4}{l}{\emph{units of radioactivity}}\\[.5ex]
     becquerel        &\unitsignonly{\becquerel}        &becquerel&\\
     megabecquerel    &\unitsignonly{\megabecquerel}    &megabecquerel&\\
     curie            &\unitsignonly{\curie}            &curie&\\
     sievert          &\unitsignonly{\sievert}          &sievert&\\
     millisievert     &\unitsignonly{\millisievert}     &millisievert&\\
     \multicolumn{4}{l}{\emph{percent}}\\[.5ex]
     percent          &\unitsignonly{\percent}          &percent&
   \end{longtable}

