bremen object## S3 method for class 'bremen':
plot(x, type, \dots)bremen object, e.g. as read by read.bremen.x should be
coerced before ploting. The choices are ctd and ladp.x seems to be a CTD dataset, uses plot.ctd;
otherwise, x is assumed to be a lowered-adp object, and a two-panel
plot is created with plot.ladp to show velocity varation with
pressure.