Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Model | Introduction | Discontinued | CPU Speed | Print resolution (DPI) Resolution is given in dots per inch (DPI) | Print speed (PPM) | Standard memory | Maximum memory |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 4000.0 | November 1997 | May 1999 | 100MHz | 1200 | 17 | 4 MB | 100 MB |
| 4050.0 | May 1999 | November 2001 | 133MHz | 1200 | 17 | 8 MB | 192 MB |
| 4100.0 | March 2001 | February 2003 | 250MHz | 1200 | 25 | 16 MB | 256 MB |
| 4200.0 | November 2002 | June/November 2005 1 | 300MHz | 1200 | 35 | 48 MB | 416 MB |
| 4240.0 | ? - Please add details on this model | ? - Discontinued | ? - 460MHz | ? - 1200 | ? - 40 | ? - 48 MB | ? - 512 MB |
| 4250.0 | November 2002 | June/November 2005 1 | 460MHz | 1200 | 43 | 48 MB | 512 MB |
| 4300.0 | December 2002 | June 2005 | 350MHz | 1200 | 45 | 64 MB | 416 MB |
Question:
What is the model number introduced May 1999?
Answer:
4050.0