[ferret_users] [las_users] some z-levels of special variables cannot be displayed by LAS

[Martin Schmidt <martin.schmidt@xxxxxxxxxxxxxxxxx>]

Hi,
I am trying to put model results on a LAS. The server is working since 
some time, hence it is not the latest version
of LAS (7.0.3) and ferret (6.2).

The data consist of many time slices in many files coupled together with 
a ferret descriptor file. Each file contains
about 20 variables and has exactly the same structure.

The configuration xml-file has old style and looks like:

<datasets>
<template_nc name="Atlantic ecosystem model" doc="">
<variables>
<eta_t
    
url="file:/u/las/las-daten/atlantic_genus_9_bio_desfiles/ocean_day.des#eta_t"
    name="sea surface height (t-cells) " units="m">
<link match="/lasdata/grids/template_nc_XT_OCEAN_YT_OCEAN_TIME_grid"/>
</eta_t>
<age_global
    
url="file:/u/las/las-daten/atlantic_genus_9_bio_desfiles/ocean_day.des#age_global"
    name="Age after surface contact" units="y">
<link 
match="/lasdata/grids/template_nc_XT_OCEAN_YT_OCEAN_ST_OCEAN_TIME_grid"/>
</age_global>
<salt
    
url="file:/u/las/las-daten/atlantic_genus_9_bio_desfiles/ocean_day.des#salt"
    name="Salinity" units="g/kg">
<link 
match="/lasdata/grids/template_nc_XT_OCEAN_YT_OCEAN_ST_OCEAN_TIME_grid"/>
</salt>

This works fine for most variables. However there are some exceptions. 
Here I get errors like

 Cached data cleared from memory
 **ERROR: command syntax: DATA_PLOTTED_MIN = ???
DEFINE SYMBOL data_plotted_min =
Command file, command group, or REPEAT execution aborted
STOP -script mode, ERROR RUNNING SCRIPT statement executed

The LAS is
http://phy-49.io-warnemuende.de:8080
The data set in question is "Atlantic ecosystem model"
salt, temperature and ecosystem variables can be displayed.
A critical variable is age_global that cannot be displayed in horizontal
sections different from the surface layer. Other sections can be shown.
I could not find the reason for this error. Offline, with ferret everything works fine.
Here is the variable definition in the netcdf file.
        float salt(time, st_ocean, yt_ocean, xt_ocean) ;
                salt:long_name = "Salinity" ;
                salt:units = "psu" ;
                salt:valid_range = -10.f, 100.f ;
                salt:missing_value = -1.e+20f ;
                salt:cell_methods = "time: mean" ;
                salt:time_avg_info = "average_T1,average_T2,average_DT" ;
                salt:coordinates = "geolon_t geolat_t" ;
                salt:standard_name = "sea_water_salinity" ;
        float age_global(time, st_ocean, yt_ocean, xt_ocean) ;
                age_global:long_name = "Age (global)" ;
                age_global:units = "yr" ;
                age_global:valid_range = 0.f, 1.e+20f ;
                age_global:missing_value = -1.e+20f ;
                age_global:cell_methods = "time: mean" ;
                age_global:time_avg_info = "average_T1,average_T2,average_DT" ;
                age_global:coordinates = "geolon_t geolat_t" ;
                age_global:standard_name = "sea_water_age_since_surface_contact" ;

Could it be that the valid_range starting with 0 is the problem? There are 0 values
of age_global in the file but no negative salinities.
(There are other data sets with age variables, but here the data sets do not have the
valid_range attribute.)

Does anyone know about such errors and/or a possible workaround?

Greetings,
Martin Schmidt