The type of tracing method to be used.
The following options are available:
U - indicates user (ICUR) coords are supplied.
R - selects re-tracing using old trace as baseline.
T - indicates that a triangle filter is to be applied
before centre location.
A - indicates that in cases of failure, the program is to
automatically fall-back to the next-least demanding
centering mode.
Plus one of the following mandatory selections:
B - basic, simple-minded centre of gravity. E - locate profile edges and interpolate. C - find centroid of profile. G - fit a Gaussian across profile.
For example:
TAG would fit Gaussians to triangle-filtered data and
automatically fall-back to try centroiding for problem
samples.
B would do simple centre-of-gravity calculations on the raw
profile, with no automatic fallback being used.
The default mode is C which provides a reasonable balance of probability-of-a-good-trace vs. time-taken. The order of specification is significant and must obey the following rules:
- Optional U or R followed by - Optional T and/or A followed by - One of B, E, C or G.
Martin Clayton