The purpose of option matrix_sections is mainly for debugging. It is useful when trying to look at numbers as the model integrates. Various quantities are printed in matrix form as a function of longitude x and depth z for specific latitudes. The latitudes and ranges of longitudes and depths for limiting the printout are input through namelist. Refer to Section 14.4 for information on namelist variables. The output from this diagnostic is written as ascii to the model printout file and there is no NetCDF capability. The interval between output is specified by variable prxzint.