st: number of dates in x axis

[Maria Ana Vitorino <vitorino@wharton.upenn.edu>]

Dear StataList users:

I have the following data:


    +------------------------+
    | Person   Weight      Date    |
    |------------------------|
 1. |  Name1       50      17988  |
 2. |  Name1       55      18110  |
 3. |  Name1       50      18141  |
 4. |  Name1       45      18171  |
 5. |    ...        .      . |
    |------------------------|
 6. |  Name2       85      18110 |
 7. |  Name2       88      18171 |
 8. |  Name3       68      17988 |
 9. |    ...        .                       . |
10. |     ..        .      .                 |
    |------------------------|
11. |  NameN        .               . |
    +------------------------+

The labels for the date variables are the months' names (plus year)  
(e.g. "jan2006", "feb2007", etc)

If I do something like:

xtline Weight , overlay  i(Person) t(Date) xlab(, valuelabel)

The month names show up on the xaxis BUT only every 6 months or so.  
How can I control the number of "ticks" (AND month names ) that show  
up on the x-axis? (suppose I want a tick every 2 months or even every  
month)

Thanks in advance,

Ana
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