+.BI \-I\ fade-in-step
+Specifies the opacity change between steps while fading in.
+.TP
+.BI \-O\ fade-out-step
+Specifies the opacity change between steps while fading out.
+.TP
+.BI \-D\ fade-delta
+Specifies the time (in milliseconds) between steps in a fade.
+.TP