By clicking ‘Data’ for the paper of interest, users can start data collection.
WebPlotDigitizer (External web system) is embedded at the bottom of the page, to extract data from images.
- Click ‘Edit‘ button at the right top of the gray region, to show up Save button.
(The ‘Edit’ button had not been implemented in the movie.)
- Select a figure to collect data for the next, from the Figure pull-down.
This pull-down contains all the figures with data, in the selected paper.
If you are going to add the first data for this figure, click ‘v’ in the right of ‘Figure’ text box. Then, input the figure name, and press Enter. This action creates a new figure associated with this paper.
The figure name should be identifiable from other users. For example, write 2(c) or 2c for Figure 2(c) in the paper. If the figure contains multiple sets of axes, different figure names should be assigned.
Once you press Enter, you cannot change the figure name.
- (optional) A brief figure caption can be added to the Caption text box.
- Select a sample to collect data for the next, from the SampleName pull-down.
This pull-down contains all the recorded samples in the selected papers.
If it is the first data for the sample, click ‘v’ in the right of SampleName text box. Then, input the sample name as shown in the plot, and press Enter. This action creates a new sample associated to this paper. Once you press Enter, you cannot change the sample name.
- (optional) Chemical composition of the sample can be added to the Composition text box. Composition of an inorganic sample may be written like Mg1.85Al0.15Si1, using chemical symbols and numbers. The ratio should be written in molar ratio.
- Select physical properties for x and y axes, from the pull-downs Property(x) and Property (y).
To add a new physical property, click ‘v’ in the pull-down, input the name of physical property, and press Enter.
- Select units of the physical properties, from the pull-downs Unit(x) and Unit(y).
To add a new unit, click ‘v’ in the pull-down, input the unit, and press Enter.
Synthetic units can be expressed by combination of various SI units (m, g, s, K, N, J, A, V, W, degC etc. ) with SI-prefixes (G, M, k, m, mu, n, p etc.) and mathematical operations (* for multiplication, / for division, ** or ^ for exponents, and brackets). American units can also be input here.
- If there is an exponent in front of the unit, you can write it in the 10^ text box.
See the table below to check how to write the exponents correctly.
- Paste the data extracted from the plot image.
Data extraction process by using WebPlotDigitizer is explained later.
- Press Save button.
When saved successfully, the data is displayed in the plot in the right.
While saving, unit conversion to default SI unit (without SI-prefixes) is carried out on the data.
(We have a confusing bug here: if you have set units and exponents in the Unit pull-downs and 10^ text boxes such that unit conversion is required, the new data is displayed in a wrong scale. In such cases, the stored data are correct, so you don’ t need to try to fix the data. When you select a different figure and come back to this figure, the data will be displayed correctly.)
|Axis label format (P: physical property, u: unit)||Number in 10^ text box|
|P [ 10n u ]||P / 10n u||n|
|10n P [ u ]||10n P / u||–n|
|×10n (at the end of axis, or within the plot)||n|