#	Add trace headers which measure increasing offsets and azimuths
#############################################################

*call	sortcut	lasttr				# preserve current ensemble boundaries
order	offind	offset				# 'offind' counts traces by increasing 'offset'
order	azind	azimuth	dec    			# 'azind' counts traces by decreasing 'azim'

	# 'seq' counts traces sequentially by receiver lines and inline numbers,
	# introducing a gap of 1 after the end of the line:

order	seq	r_line	inc	1	r_stnum	inc