# 拟合日志中的火花线

有时查看特定 MotionMetriq 在拟合过程中的变化趋势（例如在完成一次 [可持续性测试](/zh/di-04-jie-aero/sustainability-test.md).

Velogic Studio 通过名为“火花线（Spark Lines）”的功能使这一点变得容易。要查看火花线，只需点击“显示网格（SHOW GRID）”以打开拟合日志网格，然后点击一个或多个身体指标。

你会在拟合日志网格上方看到一系列线条：

![拟合日志网格显示带有所选指标彩色趋势线的火花线可视化](/files/47ae24c89a90ef250ca7230460114ecd0f78eebf)

如果一个指标有左右两侧的数值，左侧指标会显示为实线，右侧则为点线。

你可以点击多个指标，系统会自动为各条线分配不同颜色。

再次点击同一指标即可关闭该指标的火花线。


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