+ # Graph title
+ if self.graph_title:
+ args += ["--title", self.graph_title]
+
+ # Vertical label
+ if self.graph_vertical_label:
+ args += ["--vertical-label", self.graph_vertical_label]
+
+ if self.lower_limit is not None or self.upper_limit is not None:
+ # Force to honour the set limits
+ args.append("--rigid")
+
+ if self.lower_limit is not None:
+ args += ["--lower-limit", self.lower_limit]
+
+ if self.upper_limit is not None:
+ args += ["--upper-limit", self.upper_limit]
+