Cool Stars 14 - Submitted Abstract # 58 This version created on 05 October 2006 Multi-line Doppler imaging: getting the most out of your echelle John B. Rice, Brandon University, Canada Klaus G. Strassmeier, Astrophysical Institute Potsdam, Germany The advent of spectroscopic observing facilities producing large numbers of observations covering many lines in a single exposure requires that we develop Doppler Imaging techniques for working with many lines simultaneously. One possibility would be averaging together many lines to get a ``mean’’ line to analyze but we would thus lose the information necessary to actually recover a surface temperature map. Alternatively, we could work with large numbers of lines simultaneously by synthesizing long segments of the stellar spectrum and mapping with the whole spectrum. Experiments have shown this dilutes the information in the profiles of the ``good'' lines to the point where little sensitivity to the surface temperature map is left. The alternative proposed here is to work with numerous good lines extracted from the spectrum with the continuum and weak line sections removed. In this way we can retain the dependence on individual line synthesis using LTE assumptions and adopting atomic data from VALD so that the maps retain the effective surface temperature information. The map parameters are determined by relying on refining the input parameters through minimization of the fit to the full array of lines. We present here a small-scale comparative test of the mapping of the young K dwarf PW Andromedae using several Fe lines chosen from CFHT Gecko observations made in the year 2004. ----------------------------------