sample_name,subsample_name,file
frog_1,sub_a,data/frog1a_data.txt
frog_1,sub_b,data/frog1b_data.txt
frog_1,sub_c,data/frog1c_data.txt
frog_2,sub_a,data/frog2a_data.txt
frog_2,sub_b,data/frog2b_data.txt
frog_3,sub_c,data/frog3c_data.txt
