Format of mk_pos_ps input map list file.

To plot time series,
mk_pos_ps map.list sites.list output_directory
Actually, mk_pos_ps shell script calls plot_tseries program to do the work.
plot_tseries map.list SITE_GPS 2
This will create a Postscript file SITE.ps in current directory.

Format of map lists file:
[tianyf@tyf ~/tmp]$ cat qoca_map.list
virtual_run.map
That is, just those file names, no total number of files as the first line.

Format of site list file:
[tianyf@tyf ~/tmp]$ cat map.sit
bjfs
wuhn
daej


There seems a error with mk_pos_ps script:
[tianyf@tyf ~/tmp]$ mk_pos_ps qoca_map.list map.sit ps
plot_tseries qoca_map.list bjfs 2
plot time series for site bjfs
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!
plot_tseries qoca_map.list wuhn 2
plot time series for site wuhn
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!
plot_tseries qoca_map.list daej 2
plot time series for site daej
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!
minmax: No input data found!

Is this a QOCA bug? The QOCA is 1.33 version (Linux).