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:
| Stage | Date | Course | Distance | Winner | Race Leader |
| --- | --- | --- | --- | --- | --- |
| 1 | 17 May | Messina to Catania | km (mi) | Michele Mara ( ITA ) | Michele Mara ( ITA ) |
| 2 | 18 May | Catania to Palermo | km (mi) | Leonida Frascarelli ( ITA ) | Antonio Negrini ( ITA ) |
| 3 | 20 May | Palermo to Messina | km (mi) | Luigi Marchisio ( ITA ) | Luigi Marchisio ( ITA ) |
| 4 | 22 May | Reggio Calabria to Catanzaro | km (mi) | Luigi Marchisio ( ITA ) | Luigi Marchisio ( ITA ) |
| 5 | 23 May | Catanzaro to Cosenza | km (mi) | Domenico Piemontesi ( ITA ) | Luigi Marchisio ( ITA ) |
| 6 | 25 May | Cosenza to Salerno | km (mi) | Allegro Grandi ( ITA ) | Luigi Marchisio ( ITA ) |
| 7 | 27 May | Salerno to Naples | km (mi) | Raffaele Di Paco ( ITA ) | Luigi Marchisio ( ITA ) |
| 8 | 28 May | Naples to Rome | km (mi) | Learco Guerra ( ITA ) | Luigi Marchisio ( ITA ) |
| 9 | 30 May | Rome to Teramo | km (mi) | Michele Mara ( ITA ) | Luigi Marchisio ( ITA ) |
| 10 | 31 May | Teramo to Ancona | km (mi) | Michele Mara ( ITA ) | Luigi Marchisio ( ITA ) |
| 11 | 2 June | Ancona to Forlì | km (mi) | Learco Guerra ( ITA ) | Luigi Marchisio ( ITA ) |
| 12 | 3 June | Forlì to Rovigo | km (mi) | Michele Mara ( ITA ) | Luigi Marchisio ( ITA ) |
| 13 | 5 June | Rovigo to Asiago | km (mi) | Antonio Pesenti ( ITA ) | Luigi Marchisio ( ITA ) |
| 14 | 6 June | Asiago to Brescia | km (mi) | Leonida Frascarelli ( ITA ) | Luigi Marchisio ( ITA ) |
| 15 | 8 June | Brescia to Milan | km (mi) | Michele Mara ( ITA ) | Luigi Marchisio ( ITA ) |
| Total | Total | km (mi) | km (mi) | km (mi) | km (mi) |
Question:
What stage of the race was held on the course Reggio Calabria to Catanzaro?
Answer:
4.0