estaban graficando
-they/you were graphing
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verbograficar.

graficar

Anoche tuvimos perfectas condiciones de observación, y mis dos colegas astrónomos estaban graficando el sector que rodea a la Cruz del Sur.
Last night we had perfect viewing conditions, and my 2 fellow astronomers were out mapping out the area around the Southern Cross.
Palabra del día
el tejón