FUNCTION get_mydata,a,var
s = size(var)
if s[n_elements(s)-2] eq 7 then begin
w = where(tag_names(a) eq var)
if w[0] ne -1 then vnum = w[0] $
else begin
print,'ERROR>get_mydata:named variable not in structure!' & return,-1
endelse
endif else vnum = var
vtags = tag_names(a.(vnum))
ti = tagindex('HANDLE',vtags)
if ti ne -1 then begin
b = handle_info(a.(vnum).HANDLE,/valid_id)
if b eq 1 then handle_value,a.(vnum).handle,d else d=0
endif else begin
ti = tagindex('DAT',vtags)
if ti ne -1 then d = a.(vnum).dat $
else begin
print,'ERROR>get_mydata:variable has neither HANDLE nor DAT tag!'
return,-1
endelse
endelse
if n_elements(d) gt 1 then d = reform(d)
return,d
end