Start plotting into a PS device.
| 1 | plotPSstart(file = NULL, fsize = c(4, 4), ...)
 | 
| file | filename where to save the image. When this is not specified (left NULL), the function completes without doing anything. | 
| fsize | vector with two elements giving (width, height) of desired image | 
| ... | additional arguments are ignored | 
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