Table:
Feature group	Totalfeatures	Preselected featuresa	Selected featureswithin feature groupb	Featuresfinally selectedc
Moment-based features	76	71	8	1
Form-based features	86	74	16	4
Statistical features	130	86	46	29
Structural features	108	90	23	10
Spectral features	70	21	6	2
Total	470	342	99	46

Parse the picture content behind with markdown code: | Feature group | Totalfeatures | Preselected featuresa | Selected featureswithin feature groupb | Featuresfinally selectedc | 
 | --- | --- | --- | --- | --- | 
 | Moment-based features | 76 | 71 | 8 | 1 | 
 | Form-based features | 86 | 74 | 16 | 4 | 
 | Statistical features | 130 | 86 | 46 | 29 | 
 |

Structural features | 108 | 90 | 23 | 10 | 
 | Spectral features | 70 | 21 | 6 | 2 | 
 | Total | 470 | 342 | 99 | 46 |