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Source: wikipedia.org
أكثر الاشكل شيوعا له (Info)
والشكل الأكثر شيوعا هو الرسم الهندسي مع اثنين من أبعاد هي : المحور الأفقي يمثل الزمن، والمحور الرأسي هو تردد ؛ البعد الثالث يبين اتساع وتيرة معينة في وقت معين ويمثل كثافة أو لون في كل نقطة الصورة
