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alt=\"Standard Model 2.1 page 4\" width=\"212\" height=\"300\" 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https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphys\/uploads\/sites\/5088\/2016\/10\/2.1SM-004-724x1024.jpg?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEAoaCWV1LXdlc3QtMSJGMEQCIF7ZmI%2BaSVE70wLMWoajzX3CX6edMm7yBcAevLqGnveBAiAO0QgmvnfXvqWlxfxdWa4nkqSPqVZa3UZa3BL6GOClayrCBQjT%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAUaDDI3MzU3MDE5NTQzMyIMKXDnMrDM%2FIr3V%2BGUKpYFEfqdMTUmujwK70DeVmAZhNfdbvccljIzUnzvssCH6JnjsaY6mha6doPXGOESoFnAdcJH%2BnJsCGjZkDn8ssh7FUIPXyPvfakeTKHRaCFr6cMdZO%2Bq6VQLEFSU3nrnOxgL5QLXrJCchga%2FO88m4%2FKuV2T4gXDADofiWz14%2FE%2FuP9rX34GQaYqpagBrNONmKcMQC9yXcJesJNGVQwcs7pyOUlVuLWaS9KfXu9Umz3NSMXZ3SFVp%2FZsulXYNloDc%2BtMQIxVi8x%2FYIqbGbv%2FSevKPQaj5tXWToiZQ9bzlr7NVTLzRHgsNZxKyTQK92R8%2Fne9d4crzBAvteT1vgY7xNOgC%2BxvRiO2EHtyef%2BQGcbQ6cVnAOWXAJ7wxoR3IhbZgXM%2B6cacRwuGlmXunG%2Bx0fRD%2BJU1CI1l9z6bzyA9OkyZfzSfhhNTo62UGX1cIA%2Bfrk16aOv0AxgdaNIWhIFlA%2Flo4xwcR7%2FnYj9T1OThB5TEs8M1xVKdovuMRnd5cWBkJfGMulnoApHbybQkOj%2FQ9R3sDdBaUz9UDWx%2FNcgK8ijvr6qi99pNmiPA0mAuQiiQF9xxg2cG4kgoaOGPLSxbzWTgF8fFFPZ4fVXwjYfjzKIc5sacfFJQwnm8rZvi9HhmdofbHnWFSMu3q9CdMgusKEI5KrSdcnAa4RJRWFNodFt%2FKy4RXDQpHeDM%2BzUK2RXlJ4miGmGB35gGOLx3AGysPRW03Vx3xehPVTkmY%2FgYLDun%2BxsJLrFMQkilD8EwAqEeON2zZ8rj%2BgvIrJl5y2IFVF%2FhHrKCEY1yqHAxSOBurk3Jr%2BcxmHjDofEOqVueUYls76lFIQarOIOQtS1rb%2F2DgLv41XGiHYfgA5dZpCeHa69DvIj20e1IXZWYwyqXAzwY6sgHSxMn4v97YmiWJ9yoKjPFTcpEsuaC93yRTGZ3Pk62nIUyj%2BVQbxto0MnWIwGia0XGzaWIopYFH7Xon4MGacyhoZBogj0iOYd8IFm2Pttck%2Fsz42mGX3jRCCwrN%2B0jRtwi5TNRKoWLfcjPpGNWXsfkpzq7TLhbhHQ6Zw1wF4IpWkbqPNJF9ShkSlq%2F5E%2Bb8a5jpQX294oeU7pE72jpQGfIcjcYmxZuPPVl72K9XIof%2FYqDM&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47USPZELC73%2F20260428%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260428T023629Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=b9e8bbbdf36ee506dcf3461fabe6fab4c5b627df358c8c09ee43374ee572addc 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