# Spectrum
# Spectrum Definition
Spectrum 是表示质谱数据的基本数据结构，是一次扫描(Scan)的结果。由于需要支持双离子阱设备（多谱），所以一般来讲一次扫描的结果是一个 Spectrum Vector。
TIP
对于内部叠谱（average）来说，一次扫描的结果是 Spectrum Vector。
对于外部 analysis 叠谱 (average) 来说， 多次扫描的结果是 Averaged Spectrum Vector。
# Spectrum Data
| No | name | value type | unit | def |
|---|---|---|---|---|
| 1 | m/z array | double | m/z | "A data array of m/z values." |
| 2 | analog intensity array | double | volts | "A data array of intensity values." |
| 3 | counting intensity array | double | counts | "A data array of intensity values." |
| 4 | cps intensity array | double | cps | "A data array of intensity values." |
| 5 | pressure array | double | torr | "A data array of pressure measurements during scan." |
# Space charge effect checking
判断谱图是否进样量过大离子过多，导致峰形出现拖尾，谱图基线突起幅度过大
# Baseline Height (using top-hat - base line tic)
该方法受Baseline Filter的影响较大，如果采用top-hat滤波后，该方法大概率失效
# Calculate TIC
该方法应该受降噪和减基线影响，在降噪和减基线前后的差别应该比较大，需要
compute the total ion count (sum of all points' cps intensities)
# Smoothing
# Baseline Filter
# CPS Merge
# Noise Estimation
# Find Peaks (Find local maxima)
the peak vector witch return by findpeaks(), index number marked by the order of cps intensities DESC.
port from OpenMS
# Base Peak
the peak with the highest intensity. If the peak is not unique, the first peak in the container is returned.