335 	$MarkTimeStep = 6*60*60; // Major ticks are 6 hours  variable
337 	$MarkTimeStep = 24*60*60; // Major ticks are 24 hours;  variable
341 	$MarkTimeStep = 0; // Skip the standard way of drawing major tick marks below  variable
373 	$MarkTimeStep = 0; // Skip Major Tick Marks  variable
375 if ($MarkTimeStep)
387 		$MarkTime += $MarkTimeStep;
394 	$MarkTimeStep = 60*60;  // Minor ticks are 1 hour  variable
396 	$MarkTimeStep = 6*60*60; // Minor ticks are 6 hours  variable
398 	$MarkTimeStep = 24*60*60;  variable
400 	$MarkTimeStep = 0; // Skip minor tick marks  variable
402 if ($MarkTimeStep)
414 		$MarkTime += $MarkTimeStep;