Table 1: rms of the normalised measurements of the secondary calibrators (but 1642+690) after each of the data reduction stages.

	Data reduction stage
Frequency	1	2	3	4	5	6	7	8
	(%)
86 GHz	12	11	5	4	4	1.4	1.2	1.2
229 GHz	120	100	30	19	...	16	16	16