Table:
Nitrogen source	Doubling time (hour)
HD73	ΔsigL
Sarcosine	16.54	>60
Proline	30.13	>60
Histidine	15.93	16.91
Leucine	18.65	>60
Isoleucine	10.69	>60
Serine	16.84	>60
Arginine	9.71	8.75
Valine	14.74	>60

What are the following picture content in markdown style: | Nitrogen source | <COLSPAN=2> Doubling time (hour) | 
 |  | HD73

| ΔsigL | 
 | --- | --- | --- | 
 | Sarcosine | 16.54 | >60 | 
 | Proline | 30.13 | >60 | 
 | Histidine | 15.93 | 16.91 | 
 | Leucine | 18.65 | >60 | 
 | Isoleucine | 10.69 | >60 | 
 | Serine | 16.84 | >60 | 
 | Arginine | 9.71 | 8.75 | 
 | Valine | 14.74 | >60 |