Table:
Standard level	Mass of mix stock (g)	Final mass (g)	Concentration (ppm)
GL	DGuA
SL1	NA	NA	0	0
SL2	0.117	10.019	1.3	3.58
SL3	0.229	10.592	2.39	6.62
SL4	0.518	10.037	5.71	15.81
SL5	1.006	10.027	11.11	30.75
SL6	2.011	10.072	22.12	61.19
SL7	4.033	10.001	44.62	123.47

Continue parse the picture with markdown style: | <ROWSPAN=2> Standard level | <ROWSPAN=2> Mass of mix stock (g) | <ROWSPAN=2> Final mass (g) | <COLSPAN=2> Concentration (ppm) | 
 | GL | DGuA | 
 | --- | --- | --- | --- | --- | 
 | SL1 | NA | NA | 0 | 0 | 
 | SL2 | 0.117 | 10.019 | 1.3 | 3.58 | 
 | SL3 | 0.229 | 10.592 | 2.39 | 6.62 | 
 | SL4 | 0.518 | 10.037

| 5.71 | 15.81 | 
 | SL5 | 1.006 | 10.027 | 11.11 | 30.75 | 
 | SL6 | 2.011 | 10.072 | 22.12 | 61.19 | 
 | SL7 | 4.033 | 10.001 | 44.62 | 123.47 |