replace permits estout to overwrite an existing file.

append specifies that the output be appended to an existing file. It
may be used even if the file does not yet exist.

type specifies that the assembled estimates table be printed in the
results window and the log file. This is the default. Use notype to
suppress the display of the table.

showtabs requests that tabs be displayed as <T>s in both the
results window and the log file instead of in expanded form. This option does
not affect how tabs are written to the text file specified by using.