- default: size conventions (symbols, spacing)
		- font:
			- font height is: 2/3 capital-height + 1/3 descender
			- normal font in print: 9..10pt = 3.1mm..3.5mm (1pt is about 0.3528mm)
		- RT print:
			- pin grid: ~4 mm
			- font height (pin label): height=3mm (9pt); capital ~ 2mm
			- resistor body: 5mm*2mm, pin-to-pin len: 10mm
			- diode: trinagle 2.5mm*2.5mm
			- transistor dia: 8mm
			- opamp triangle: 9mm*9mm
		- gschem:
			- default grid: 100
			- A4 titleblock is 116*82 grid; 11600*8200; 1mm = 39 grid; 1mil = 1 grid
			- pin grid: 200 = 5.1mm
			- font height
				- pin label: cap100+desc30 = 2.56+0.76 = ~3.3mm (9.5pt)
				- refdes label: cap125+desc39 = 3.2+1 = ~4.2mm (12pt)
			- resistor body: 600*200 = 15.4mm*5.1mm, pin-to-pin len: 900 = 23mm
			- diode: trinagle 400*300 = 10.25mm*7.7mm
			- transitor dia: 640 = 16mm
			- opamp triangle: 800*600 = 20.5mm * 15.4mm
		- sch-rnd:
			- pin grid: 4000 (4.096mm)
			- font height:
				- pin label: 3000 (3.072mm ~8.7pt)
				- refdes label: 4000 (4.096mm ~ 11.5pt)