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Figure 4. Examples of the thermal demagnetization of Vendian rock samples. Given from left to right are the curves depicting changes in the value of natural remanent magnetization in the course of thermal demagnetization; the stereoprojection of its directions (in the geographical coordinates); the Ziyderveld diagram (in the same coordinates); the empty circles show the projections of the vectors onto the upper hemisphere (the vector projection in the XOZ plane for the Ziyderveld diagrams), the solid circles denote the projections of the vectors onto the lower hemisphere (in the XOY plane for the Ziyderveld diagrams); the numbers near the dots denote the heating temperatures; the letter indices shown in the straight segments of the Ziyderveld diagrams (in accordance with the indices given in Tables 1 and 2) indicate the disintegrating components.
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