 The Kathisma is divided into three sections (called "stases") of five psalms each.During Great Lent the Eighteenth Kathisma is read every weekday (Monday through Friday evening) at Vespers, and on Monday through Wednesday of Holy Week.In the Slavic usage this Kathisma is also read from the apodosis of the Exaltation of the Cross up to the forefeast of the Nativity of Christ, and from the apodosis of Theophany up to the Sunday of the Prodigal Son.