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You can label intervals within MEGS_Log with a sample number.

Different intervals within the one borehole can have the same sample number and the sample numbers don't need to be in any particular order down the whole.

You can print a table of sample numbers for a particular whole. This may be useful for physically labelling the samples.

Sample numbers can consist of any printable characters, letters, numbers and other symbols. However, MEGS_Log can recognise sample numbers with a particular format. When MEGS_Log recognises a sample number format it can automate some actions such as relabelling or reordering the sample numbers.

Sample numbers that MEGS_Log recognise are in the format [A]B[C], where:

- [A] is an optional sequence of one or more characters- this is the sample number prefix.
- B is a required sequence of one or more digits (the sample number proper).
- [C] is an optional sequence of one or more non-digit characters (anything printable other than the digits 0-9) - this is the sample number postfix.

Digits in the sample number prefix must be separated from the digits in the sample number proper by one or more non-digit characters.

Some examples of sample numbers that MEGS_Log recognises:

- 12345 (this sample number has no prefix and no postifx)
- ABC123 (this sample number has ABC as the prefix and no postfix)
- A1_456Z (this sample number has A1_ as the prefix and Z as the postfix, with the underbar character separating the digits in the prefix from the sample number proper.

Sample numbers do not have to comply with the above format, however some of sample number tools provided in MEGS_Log may not be available, or may not work correctly.