The following table summarizes how to perform basic activities with the Histogram Tool.
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To Change or Select the Channel
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Type a new channel name in the entry field near the top left of the tool or using the drop-down menu, select a name from the list.
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To Log Transform the Data (retains raw data statistics) 
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Select the Log button near the bottom left of the tool. Check mark should appear.
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To display the histogram as a cummulative %. 
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Select the Prob (Probability) button near the bottom left of the tool. Check mark should appear. This option re-scales the cumulative % curve as if the data were normally distributed. The vertical scale is based on units of standard deviation. For data which is normally distributed the cumulative % curve will plot as a straight line (constant slope).
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Positioning the Cursor by Clicking
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Click inside the Histogram window. The system places a vertical point where you clicked.
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Positioning the Cursor with Left and Right Buttons
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Press the left arrow or right arrow buttons. The system moves the vertical cursor one division in the histogram to the left or right.
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Changing Min/Max values
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Type new values in the entry fields below the Histogram window.
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Changing the Number of Divisions
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Type a new value in the corresponding entry field.
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Working Out Percentile Values
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Position the cursor by clicking or moving the left and right arrow buttons. The system displays the corresponding percentile values in the Cursor Position area near the bottom left of the tool.
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Updating Values after Making Changes in Data (Pump tool) 
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If you make changes in the database (for example, by changing value or replacing them with dummies), you must update the Histogram window by clicking the Data Pump tool button near the bottom left corner of the tool.
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Plotting the Histogram Screen for Reports and Maps 
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Select an open map, and click the Print button near the bottom left of the tool. The system asks you where on the map you wish to place the histogram. Type values or use the Locate button to place the histogram interactively.
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Plot Classified Colour Symbols on the Current Map 
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Select an open map and press the colour symbol button. Specify the attributes for the selected symbols and click OK to draw the symbols on the map.
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Plot Symbol Legend on the Current Map 
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Select an open map and press the symbol legend button. Enter the legend information and press Locate to position the legend. Click OK to draw the legend on the map.
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Box-whisker Plot
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Provides a quick visual indication of the histogram for log normal on a skewed distribution. The box indicates the percentile range and the whisker lines represent the next 10 percent on either side Note: the default percentile range is 20 – 80. The percentile range may be changed to 25 – 75 in Geochem Import|Pereferences.
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Make Original Size 
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You can now resize the histogram tool by dragging any side of the tool to a larger size. Clicking the Make original Size button returns the histogram to the original size.
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Define Masking Limits 
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You can now define mask limits. Click the Define Masking Limits button. The curser appears as a cross. Click the left mouse button at the lower extreme of your mask limit, and then left click at the upper extreeme. The mask area will be highlighted.
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Apply current limits to mask channel 
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After defining your masking limits, click the Apply current limits to mask channel button. The Set Mask based on data range dialog is display. Specify your parameters and click OK to apply the limits to the selected mask channel.
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Reset mask channel 
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The Reset mask channel button enables you to reset the mask channel and set all values in the Mask channel to 1.
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