Added x- and y- axis selectors (addresses #253 )

content/v2.0/visualize-data/visualization-types/graph-single-stat.md

@@ -12,6 +12,10 @@ dropdown in the upper right.
 To view **Graph + Single Stat** controls, click the settings icon ({{< icon "gear" >}})
 next to the visualization dropdown in the upper right.
 
+###### Data
+- **X Column**: Select a column to display on the x-axis.
+- **Y Column**: Select a column to display on the y-axis. 
+
 ###### Options
 - **Line Colors**: Select a color scheme to use for your graph.
 

content/v2.0/visualize-data/visualization-types/graph.md

@@ -10,6 +10,10 @@ in the upper right.
 To view **Graph** controls, click the settings icon ({{< icon "gear" >}}) next
 to the visualization dropdown in the upper right.
 
+###### Data
+- **X Column**: Select a column to display on the x-axis.
+- **Y Column**: Select a column to display on the y-axis.
+
 ###### Options
 - **Interpolation**: Select from the following options:
   - **Line**: Display a time series in a line graph

content/v2.0/visualize-data/visualization-types/heatmap.md

@@ -13,8 +13,8 @@ To view **Heatmap** controls, click the settings icon ({{< icon "gear" >}})
 next to the visualization dropdown in the upper right.
 
 ###### Data
-- **X Column**: Select the column to use for the x-axis.
-- **Y Column**: Select the column to use for the y-axis.
+- **X Column**: Select a column to display on the x-axis.
+- **Y Column**: Select a column to display on the y-axis.
 
 ###### Options
 - **Color Scheme**: Select a color scheme to use for your heatmap.

content/v2.0/visualize-data/visualization-types/scatter.md

@@ -11,6 +11,8 @@ to the visualization dropdown in the upper right.
 ###### Data
 - **Symbol column**: Define a column containing values that should be differentiated with symbols.
 - **Fill column**: Define a column containing values that should be differentiated with fill color.
+- **X Column**: Select a column to display on the x-axis.
+- **Y Column**: Select a column to display on the y-axis. 
 
 ###### Options
 - **Color Scheme**: Select a color scheme to use for your scatter plot.