At the bottom of each graph page, there is a box you can use to set graphing preferences and apply digital filters to the data. The following sections describe the available options. Note that not every option is available on every page.
When comparing data from multiple users, multiple versions, or multiple stations, you can superimpose the graphs for a detailed comparison.
To superimpose the graphs, put a check in the box labeled Superimpose graphs and then click Apply Changes. The web site superimposes the graphs, which are drawn in different colors. The web site also displays a key to indicate which color corresponds to each user, version, or station.
To draw separate graphs, remove the check from the box labeled Superimpose graphs and then click Apply Changes.
The web site remembers this setting so long as you stay on the site.
You can control the width and height of the graphs, by specifying how many pixels you want in each direction. The size in each direction can range from 100 to 1600 pixels. The default size is a width of 800 pixels and a height of 400 pixels.
To change the plot size, enter the desired size, in pixels, into the boxes labeled width and height. Then click Apply Changes.
The plot size refers to just the size of the graph, not the numbers and labels that surround it.
The web site remembers this setting so long as you stay on the site.
You can control the thickness of the curves drawn in the graphs. The thickness can range from 1 to 32 pixels. The default thickness is 3 pixels.
To change the curve thickness, enter the desired thickness into the box labeled Curve thickness in pixels. Then click Apply Changes.
The web site remembers this setting so long as you stay on the site.
The web site can apply a low-pass filter to time-series data. The low-pass filter removes any high-frequency noise or oscillations in the data.
To apply a low-pass filter, enter the desired cutoff frequency in Hertz into the filter frequency box. Then click Apply Changes.
To remove the filter, clear the filter frequency box, and then click Apply Changes.
The web site remembers this setting so long as you stay on the site.
Note: The filter used is a two-pass two-pole Butterworth filter. The filter frequency is the 3dB cutoff frequency.
You can control the range of data values that appear on the x-axis. By default, the web site attempts to choose a range that fits the available data.
To change the range, enter the desired values into the boxes labeled left and right. Then click Apply Changes.
Ordinarily, the left value should be less than the right value. If you make the left value greater than the right value, the graph is flipped left-to-right.
You can control the range of data values that appear on the y-axis. By default, the web site attempts to choose a range that fits the available data.
To change the range, enter the desired values into the boxes labeled bottom and top. Then click Apply Changes.
For time-series data, ordinarily the bottom value should be less than the top value. If you make the bottom value greater than the top value, the graph is flipped bottom-to-top.
For rupture-front contour plots, ordinarily the bottom value should be greater than the top value (because the y-axis is labeled by depth). If you make the bottom value less than the top value, the graph is flipped bottom-to-top.
For contour plots and X-Y plots, you can tell the web site to use the same scale on the x-axis and y-axis.
To use the same scale on both axes, put a check in the box labeled Use the same scale on both axes and then click Apply Changes. When you do this, the web site automatically adjusts the plot size and data ranges to achieve the same scale on the x-axis and y-axis.
To remove this setting, remove the check from the box labeled Use the same scale on both axes and then click Apply Changes.
Click on Restore Defaults to restore all the graphing preferences to their default values, and re-draw the graphs.
A maximum of 12 graphs can be drawn on a single page. If you have selected more than 12 graphs, they are spread over several pages, and you can use the arrow buttons to page through them.
Click > to advance to the next page.
Click >> to advance to the last page.
Click < to go back to the previous page.
Click << to go back to the first page.