Light curve of the event OGLE-2019-BLG-0033 showing all observations from different telescopes as described in the text. The black curve is the best microlens-ing model for ground observers, and the red curve is the best model for Spitzer observations, as described in Sect. 3. In the bottom panel, we show the residuals from several models: best model including the parallax and orbital motion, best model with parallax without orbital motion, and best static model without parallax.