Oleg
Are the character arrays within your structure fully populated, or are they being initialized with strings that are significantly shorter (>20%(?))than the character arrays themselves. If this is the case, could it be that your array of structures is taking up more code space because of the memory allocations for the character arrays than is required by the init code to copy the initialization data (which should be very compact) from code to xdata?
Just a thought.
Chris