mkdir ~/usr/local/atat
cd ~/usr/local/atat
wget https://avdwgroup.engin.brown.edu/atat3_36.tar.gz
tar xvzf atat3_36.tar.gz
mv atat atat3_36
requires g++, tsch, csh
if using WLS,
sudo apt install g++
sudo apt install tsch
sudo apt install csh
then compile it
make
make install