Add Stepscan flowchart re #9726

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

Code/Mantid/docs/source/algorithms/StepScan-v1.rst

@@ -12,7 +12,6 @@ Description
 This algorithm is for producing rocking curves from alignment scan runs.
 It is for use only with ADARA-style SNS datasets as it requires the
 'scan\_index' log variable.
-
 The algorithm optionally uses the :ref:`algm-MaskDetectors`
 and/or :ref:`algm-FilterByXValue` algorithms to restrict the
 region of data included. **N.B. If these options are used, then this
@@ -22,5 +21,17 @@ The :ref:`algm-SumEventsByLogValue` algorithm is then
 called, with 'scan\_index' as the log to sum against. The row of the
 resulting table pertaining to scan\_index=0 (which indicates 'not a scan
 point') is then removed.
+
+Before then it will call other algorithms as shown in the flowchart,
+if the relevent inputs have been set.
+:ref:`algm-MaskDetectors` will be called if a MaskWorkspace is supplied.
+If either Xmin or Xmax or both are supplied, 
+then :ref:`algm-FilterByXValue` algorithm is run to restrict the
+region of data included and if RangeUnit is not TOF,
+:ref:`algm-ConvertUnits` is run beforehand.  
+
+If necessary, the imput workspace is cloned, to save it from being modified.
+
+.. image:: ../images/StepScanWorkflow.png
 
 .. categories::

Code/Mantid/docs/source/diagrams/StepScanWorkflow.xml

@@ -0,0 +1 @@
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