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[ferret_users] define/axis/like

Hi all,

It would be nice to be able to duplicate an axis with a /like qualifier.
If the qualifier /units is changed then the axis is modified only about this behaviour. This will allow changing of units (seconds to days) keeping correctness definition of edges
and changing on reference dates (units since...).

For example:
define axis/like=t[g=var1]/units="days since 1850-01-01 00:00:00" mytaxis
will define a new axis called mytaxis similar to the time axis from the variable var1
with units changed as days and T0 changed with a new date reference.

This wish is relative to my work of the day where I am dealing with yearly time series splitted following different experiments of the AR5 exercice and that have been produced with different reference dates (1850, 2000).

I would like to plot them as a concatenation. It can be done using a descriptor file
but unfortunately I have to manage the different reference dates used (T0).
And so, I am looking for a method to translate a time serie since "2000-01-01 00:00:00"
to a time serie since "1850-01-01 00:00:00"

Idealy, when I build my descriptor I use
`var, return=tstart`
`var, return=tend`
it would be nice to have
`var, return=tstart, T0="1850-01-01 00:00:00"`
`var, return=tend, T0="1850-01-01 00:00:00"`


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