option "size" - "Size for the output image" int multiple no default="512"
option "spacing" - "Spacing for the output image" double multiple no default="0.8"
-option "panel_position" - "Position of the panel: small, medium or large" string no default="small"
+option "panel_position" - "Approximate position of the panel: small, medium or large" string no default="small"
+option "panel_shift" - "Precise position of the panel in mm" double multiple no