Metric Chart Combo Box Ordering

Edit the order below. Top = most useful/most likely to be used. Bottom = least useful. When finalized, this order will be applied to all 3 combo boxes (X-axis, Primary, Secondary) and the corresponding constants in ChartGenerator.cs.

The Secondary combo box always has “None” as index 0; everything else follows this order. The X-axis combo box always has “Time” and “Frame Index” as indices 0-1; everything else follows.

Proposed Order

#	Metric	Unit	Why this rank	Category
1	HFR	px	Universal quality metric, every imager watches this	Image Quality
2	FWHM	arcsec	Second most popular quality metric (requires Hocus Focus)	Image Quality
3	Guiding RMS	arcsec	Everyone who guides watches this	Guiding
4	Star Count	count	Common quality/sky condition indicator	Image Quality
5	Eccentricity	ratio	Popular with Hocus Focus users, shows optical/tracking issues	Image Quality
6	Altitude	degrees	Shows target rising/setting through the night	Pointing
7	Airmass	ratio	Atmospheric extinction, pairs with altitude	Pointing
8	Focuser Temp	C	Key driver of focus drift	Temperature
9	Ambient Temp	C	Affects focus and dew, widely available	Temperature
10	Focuser Position	steps	Shows focus drift directly	Equipment
11	Camera Temp	C	Verify cooler is holding setpoint	Temperature
12	Cooler Setpoint	C	Paired with camera temp for cooling health	Temperature
13	Humidity	%	Dew prevention, widely available from weather devices	Weather
14	Dew Point	C	Dew prevention, paired with ambient temp	Weather
15	Sky Quality	mag/arcsec2	Light pollution monitoring (requires SQM device)	Sky Conditions
16	Cloud Cover	%	Weather monitoring (requires cloud sensor)	Sky Conditions
17	Sky Temp	C	IR cloud detection – user-requested feature	Sky Conditions
18	Median ADU	ADU	Background level, shows sky darkening/brightening	Image Statistics
19	Mean ADU	ADU	Background level (less robust than median)	Image Statistics
20	Wind Speed	m/s	Seeing/mount stability/safety	Weather
21	Wind Gust	m/s	Peak wind, complements wind speed	Weather
22	Pressure	hPa	Atmospheric conditions, slow-moving	Weather
23	Seeing FWHM	arcsec	External ASCOM seeing monitor (rare device)	Sky Conditions
24	Std Deviation	ADU	Noise metric, complements HFR/FWHM	Image Statistics
25	MAD	ADU	Robust noise metric (less outlier-sensitive than StDev)	Image Statistics
26	Exposure	s	Usually constant, useful for mixed-length workflows	Capture Settings
27	Gain	value	Usually constant, useful for multi-gain workflows	Capture Settings
28	Azimuth	degrees	Niche, mostly flat unless tracking across meridian	Pointing
29	Wind Direction	degrees	Niche, requires ASCOM ObservingConditions	Weather
30	Sky Brightness	Lux	Niche, few people have Lux sensors	Sky Conditions
31	Rotator Position	degrees	Only for rotator users	Equipment
32	Position Angle	degrees	From plate solving, niche	Pointing
33	Offset	value	Almost never changes mid-session	Capture Settings
34	Min ADU	ADU	Sensor floor, noisy, dominated by hot pixels	Image Statistics
35	Max ADU	ADU	Saturation detection, noisy, dominated by cosmic rays	Image Statistics