Technical considerations

- Select the above Menu to find the information required.

- Press shift + the icon containing the pattern required to compare patterns simultaneously.

- Press the mouse on the menu bar to place the window wherever you like.

- Press the mouse and slide it to the borders of the patterns in order to adjust and compare them.

- Those patterns that, in addition to the positive and negative ordinary icon, present an "e" allow for a closer approach to relevant technical data.

Looking forward to the utility of this scientific material.

The editors