ChemTab - A Periodic Table Data Base (C) 1989 Jim King - Programmer's Manual
								Page  P4

2b2. Adding a characteristic to the program

	1. Choose a four-letter abbreviation for the characteristic.
	   We will call this the 4LC.

	2. Choose a negative value for the characteristic which is NOT
           a value for ANY element.  We will call this UNDF.

	3. Add the line to undefs.h:
		4LC = UNDF;
	   where appropriate.

	4. Edit looke.c, dogph.c, vdata.c, and esort.c appropriately

	5. Edit variables.h->sopts[] appropriately, and schar.c

	6. If there's anything I missed, put it here.

	7. Oh yeah, change PERTABLE

	8. make install
